OVERVIEW MC68332
3-8 USER’S MANUAL
IFETCH CPU32 Output —
IPIPE
CPU32 Output —
IRQ[7:1]
SIM Input 0
MISO QSM Input/Output —
MODCLK SIM Input —
MOSI QSM Input/Output —
PC[6:0] SIM Output (Port)
PCS[3:0] QSM Input/Output —
PE[7:0] SIM Input/Output (Port)
PF[7:0] SIM Input/Output (Port)
PQS[7:0] QSM Input/Output (Port)
QUOT SIM Output —
RESET
SIM Input/Output 0
RMC
SIM Output 0
R/W
SIM Output 1/0
RXD QSM Input —
SCK QSM Input/Output —
SIZ[1:0] SIM Output —
SS
QSM Input 0
T2CLK TPU Input —
TPUCH[15:0] TPU Input/Output 1
TSC SIM Input —
TXD QSM Output —
XFC SIM Input —
XTAL SIM Output —
Table 3-5 MCU Signal Function
Signal Name Mnemonic Function
Address Bus ADDR[23:0] 24-bit address bus
Address Strobe AS
Indicates that a valid address is on the address bus
Autovector AVEC
Requests an automatic vector during interrupt acknowledge
Bus Error BERR
Indicates that a bus error has occurred
Bus Grant BG
Indicates that the MCU has relinquished the bus
Bus Grant Acknowledge BGACK
Indicates that an external device has assumed bus mastership
Breakpoint BKPT
Signals a hardware breakpoint to the CPU
Bus Request BR
Indicates that an external device requires bus mastership
System Clockout CLKOUT System clock output
Chip Selects CS[10:0]
Select external devices at programmed addresses
Boot Chip Select CSBOOT
Chip select for external boot start-up ROM
Data Bus DATA[15:0] 16-bit data bus
Data Strobe DS
During a read cycle, indicates when it is possible for an external
device to place data on the data bus. During a write cycle,
indicates that valid data is on the data bus.
Data and Size Acknowledge DSACK[1:0]
Provide asynchronous data transfers and dynamic bus sizing
Development Serial In, Out,
Clock
DSI, DSO,
DSCLK
Serial I/O and clock for background debugging mode
Crystal Oscillator EXTAL, XTAL Connections for clock synthesizer circuit reference;
a crystal or an external oscillator can be used
Table 3-4 MCU Signal Characteristics (Continued)
Signal
Name
MCU
Module
Signal
Type
Active
State
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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