Renesas M16C Series User Manual

Precautions
M30240 Group
Rev.1.00 Sep 24, 2003 Page 120 of 360
1.3.1.9 Stop Mode and Wait Mode
When returning from stop mode by hardware reset, RESET
pin must be set to “L” level until main clock
oscillation is stabilized.
When entering either wait or stop mode, you must first enable any interrupts you want to cancel the
wait or stop. Also, make sure to disable any interrupts that you don’t want to cancel the wait or stop.
If only hardware reset or NMI
interrupts are desired to cancel wait or stop, all other interrupt priority
levels should be set to “0”
If using f
SYN
as the internal clock, switch it to f(X
IN
) before entering stop mode.
When switching to either wait or stop mode, the WAIT instruction or the instruction that sets the all
clock stop bit to “1” are prefetched within the instruction queue before the program stops. Put at least
four NOPs in succession after the WAIT instruction or after the instruction that sets the all clock stop
control bit to “1.”
1.3.1.10 Timer A (Timer mode)
Reading the Timer Ai register while a count is in progress allows reading, with arbitrary timing, the val-
ue of the counter. Reading the Timer Ai register with the reload timing gets “FFFF
16
”. Reading the Tim-
er Ai register after setting a value in the Timer Ai register with a count halted but before the counter
starts counting gets a proper value.
1.3.1.11 Timer A (Event counter mode)
1. Reading the Timer Ai register while a count is in progress allows reading, with arbitrary timing, the
value of the counter. Reading the Timer Ai register with the reload timing gets “FFFF
16
” by underflow
or “0000
16
” by overflow. Reading the Timer Ai register after setting a value in the Timer Ai register with
a count halted but before the counter starts counting gets a proper value.
2. When counting has stopped in free-run type, set the timer again.
3. When using Free-run type, the timer’s register contents may be undefined when counting starts. Set
the timer value immediately after counting has started.
• When the up/down count is not switched:
•Enable the reload function and set a value to the timer register before counting starts.
•Rewrite the value to the timer register immediately after counting has started. (This is the same operation
as free-run type.)
•If counting up, rewrite 0000
16.
•If counting down, rewrite FFFF
16.
• When the up/down count is switched:
•Use the reload type until the first count pulse is input.
•Switch to free-run type afterwards.
1.3.1.12 Timer A (One-shot Timer mode)
1. Setting the count start flag to “0” while the count is in progress causes:
• The counter to stop counting
• The contents of the reload register are reloaded
• The TAiOUT pin outputs “L” level
• The interrupt request is generated
2. Timer Ai interrupt request bit goes to “1” if the operation mode is set by:
• Selecting one-shot timer mode after reset
• Changing operation mode from timer mode to one-shot timer mode
• Changing operation mode from event counter mode to one-shot timer mode
Note: To use Timer Ai interrupt request bit, clear the Timer Ai interrupt request bit to “0” after these
changes have been made.

Renesas M16C Series Specifications

General

Architecture	16-bit
Core	M16C
Instruction Set Architecture	CISC
Flash Memory	Up to 512 KB
Operating Voltage	2.7V to 5.5V
Operating Temperature Range	-40°C to +85°C
Package Types	LQFP, QFP
Timers	Multiple 16-bit timers
ADC	10-bit
Communication Interfaces	UART, SPI, I2C
Interrupts	Multiple interrupt sources

Summary

Chapter 1: Hardware

1.1 Description

Overview of the M30240 group as a single-chip USB peripheral microcontroller based on M16C family.

1.1.1 Features

Lists the key features of the M30240 group, including CPU, USB capabilities, memory, voltage, and peripherals.

1.1.3 Pin Configuration

Shows the pin configuration (top view) of the M30240 group, detailing each pin's name, I/O, and basic function.

1.1.4 Block Diagram

Presents a block diagram illustrating the internal structure and major components of the M30240 group.

1.1.5 Performance outline

Details the performance specifications of the M30240 group, including instruction count, memory capacity, and I/O ports.

1.1.6 Pin Description

Provides a detailed description of each pin of the M30240 microcontroller, including its name, I/O type, and functions.

CHAPTER 2: PERIPHERAL FUNCTIONS USAGE

2.1 Protect

Explains the protect function to prevent unintended changes to important registers when a program runs away.

2.2 Timer A

Provides an overview and detailed operation modes of the 16-bit Timer A, including timer, event counter, and PWM modes.

2.3 Timer B

Details the operation and registers of Timer B, a 16-bit timer that operates only in timer mode.

2.4 Clock-Synchronous Serial I/O

Explains clock-synchronous serial communication, including transmission/reception formats, transfer rates, and error detection.

2.5 Clock-Asynchronous Serial I/O (UART)

Covers UART operations, including transmission/reception formats, transfer rates, error detection, and functions like SIM interface compliance.

2.6 A-D Converter

Describes the A-D converter, its modes of operation, conversion clock, conversion time, and related registers.

2.7 DMAC

Explains the DMAC (Direct Memory Access Controller) for data transfer between memory and peripherals without CPU intervention.

2.10 Address Match Interrupt

Explains the address match interrupt functionality for simplified debugging, including enable/disable and timing.

2.11 Key-Input Interrupt

Describes the key-input interrupt, which is generated by falling edges on Port 0 or Port 1 pins used as input.

2.12 Power Control

Explains power control modes (Normal, Wait, Stop) for reducing CPU power consumption by stopping oscillators or clocks.

2.13 Programmable I/O Ports

Details the programmable I/O ports, including direction registers, port registers, pull-up control, and high drive capacity.

Chapter 3 Universal Serial Bus

3.1 Frequency Synthesizer

Explains how to set up and use the frequency synthesizer to generate the 48MHz clock for USB and DC-DC converter power.

3.2 Universal Serial Bus

Provides an overview of the Universal Serial Bus (USB) features, including specification compatibility, error handling, and transfer types.

3.2.2 USB Related Registers

Lists and describes USB-related registers for controlling USB functionality, including control, status, and enable registers.

3.2.7 USB Interrupts

Details the types of USB interrupts (Function, Reset, Resume, SOF, Suspend) and their handling via enable flags and priority levels.

3.2.8 USB Function Control Unit Initialization

Outlines the initialization routine for the USB Function Control Unit, including frequency synthesizer setup and endpoint initialization.

3.2.9 USB Control Transfers and SET_ADDRESS Request

Explains USB control transfers, the SET_ADDRESS request, and procedures for setting the device address.

Chapter 4 Interrupts

4.1 Overview of Interrupts

Provides an overview of interrupt types, including software, hardware, special, and peripheral I/O interrupts.

4.1.1 Type of Interrupts

Classifies interrupts into maskable and non-maskable types, detailing software and hardware interrupt categories.

4.1.2 Interrupt Vector Tables

Describes interrupt vector tables, including fixed and variable types, and lists interrupts assigned to fixed vector tables.

4.1.3 Interrupt Control

Explains interrupt control registers, interrupt request bits, enable flags, and priority levels for managing interrupts.

4.1.4 Interrupt Sequence

Details the sequence of operations when an interrupt occurs, including saving registers and processor control flow.

4.1.5 Multiple Interrupts

Explains how multiple interrupts are handled, including priority levels and interrupt acceptance conditions.

Chapter 5 Built-in PROM Version

5.1 Built-in PROM Version

Introduces the built-in PROM version, its functions, and available types (OTP and EPROM).

5.1.1 Outline

Outlines the capabilities of the built-in PROM version, including programming methods and suitability for different production volumes.

5.2 EPROM version

Describes the EPROM version, its operating modes (Normal, EPROM), and related pins.

5.2.1 EPROM mode pins

Lists pin functions specifically for the EPROM mode, detailing their roles in programming and verification.

5.2.2 Input/Output signals

Explains the input/output signals for Read, Program, and Erase operations in EPROM mode.

5.2.3 Algorithm Programming

Details the step-by-step algorithm for programming the built-in PROM, including voltage settings and pulse application.

5.3 Usage Precaution

Provides precautions for using built-in PROM versions, including handling of high voltage and protection of the EPROM window.

5.3.1 Built-in PROM versions

Offers specific cautions for programming built-in PROM versions, emphasizing voltage and power-on sequences.

5.3.2 One-time PROM versions

Highlights that OTP versions are not tested/screened, recommending programming and testing for reliability.

5.3.3 EPROM versions

Advises on protecting the EPROM window from light and cleaning it before erasure for optimal performance.

Chapter 6 Standard Characteristics

6.1 Standard DC Characteristics

Presents standard DC characteristics of the M30240EC, including output currents and voltage ratings.