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Atmel AVR AT90S2313 User Manual

Atmel AVR AT90S2313
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32
AT90S2313
0839G–08/01
direction control bit must be set (one) to control an output pin. The control configuration
is shown in Table 8.
Note: In PWM mode, these bits have a different function. Refer to Table 12 for a detailed
description.
• Bits 5..2 – Res: Reserved Bits
These bits are reserved bits in the AT90S2313 and always read zero.
• Bits 1,0 – PWM11, PWM10: Pulse Width Modulator Select Bits
These bits select PWM operation of Timer/Counter1 as specified in Table 9. This mode
is described on page 35.
Timer/Counter1 Control
Register B – TCCR1B
• Bit 7 – ICNC1: Input Capture1 Noise Canceler (4 CKs)
When the ICNC1 bit is cleared (zero), the input capture trigger noise canceler function is
disabled. The input capture is triggered at the first rising/falling edge sampled on the ICP
(input capture pin) as specified. When the ICNC1 bit is set (one), four successive sam-
ples are measured on the ICP (input capture pin), and all samples must be high/low
according to the input capture trigger specification in the ICES1 bit. The actual sampling
frequency is the XTAL clock frequency.
• Bit 6 – ICES1: Input Capture1 Edge Select
While the ICES1 bit is cleared (zero), the Timer/Counter1 contents are transferred to the
Input Capture Register (ICR1) on the falling edge of the input capture pin (ICP). While
the ICES1 bit is set (one), the Timer/Counter1 contents are transferred to the Input Cap-
ture Register (ICR1) on the rising edge of the input capture pin (ICP).
• Bits 5, 4 – Res: Reserved Bits
These bits are reserved bits in the AT90S2313 and always read zero.
Table 8. Compare 1 Mode Select
COM1A1 COM1A0 Description
0 0 Timer/Counter1 disconnected from output pin OC1
0 1 Toggle the OC1 output line.
1 0 Clear the OC1 output line (to zero).
1 1 Set the OC1 output line (to one).
Table 9. PWM Mode Select
PWM11 PWM10 Description
0 0 PWM operation of Timer/Counter1 is disabled
0 1 Timer/Counter1 is an 8-bit PWM
1 0 Timer/Counter1 is a 9-bit PWM
1 1 Timer/Counter1 is a 10-bit PWM
Bit 7654 3210
$2E ($4E) ICNC1 ICES1 CTC1 CS12 CS11 CS10 TCCR1B
Read/Write R/W R/W R R R/W R/W R/W R/W
Initial value0000 0000

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Atmel AVR AT90S2313 Specifications

General IconGeneral
ArchitectureAVR
CPU8-bit
ManufacturerAtmel
ModelAT90S2313
Flash Memory2 KB
SRAM128 Bytes
EEPROM128 Bytes
Clock SpeedUp to 10 MHz
I/O Pins15
Timer1 x 8-bit, 1 x 16-bit
Operating Temperature Range-40°C to +85°C
Data Bus Width8-bit
Communication InterfacesUSART
PackageSOIC
SeriesAVR AT90S

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