Datasheet
MC68332 MOTOROLA
MC68332TS/D 13
2.5 Signal Function
TSC SIM Input —
TXD QSM Output —
XFC SIM Input —
XTAL SIM Output —
Table 6 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, indi-
cates 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
Function Codes FC[2:0] Identify processor state and current address space
Freeze FREEZE Indicates that the CPU has entered background mode
Halt HALT
Suspend external bus activity
Instruction Pipeline IFETCH
IPIPE
Indicate instruction pipeline activity
Interrupt Request Level IRQ[7:1]
Provides an interrupt priority level to the CPU
Master In Slave Out MISO Serial input to QSPI in master mode;
serial output from QSPI in slave mode
Clock Mode Select MODCLK Selects the source and type of system clock
Master Out Slave In MOSI Serial output from QSPI in master mode;
serial input to QSPI in slave mode
Port C PC[6:0] SIM digital output port signals
Peripheral Chip Select PCS[3:0] QSPI peripheral chip selects
Port E PE[7:0] SIM digital I/O port signals
Port F PF[7:0] SIM digital I/O port signals
Port QS PQS[7:0] QSM digital I/O port signals
Table 5 MCU Signal Characteristics (Continued)
Signal Name MCU Module Signal Type Active State
Fr
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Freescale Semiconductor, Inc.
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