
MC68CK338
MC68CK338TS/D
MOTOROLA
11
Data Strobe
DS
Indicates that an external device should place valid data on the data bus
during a read cycle and that valid data has been placed on the bus by
the CPU during a write cycle
Acknowledges to the SIML that data has been received for a write cycle,
or that data is valid on the data bus for a read cycle
Serial I/O and clock for background debugging mode
Data and Size
Acknowledge
Development Serial
In, Out, Clock
Function Codes
Freeze
Halt
Instruction Pipeline
Interrupt Request
Level
DSACK[1:0]
DSI, DSO,
DSCLK
FC[2:0]
FREEZE
HALT
IFETCH, IPIPE
Identify processor state and current address space
Indicates that the CPU has entered background mode
Suspend external bus activity
Indicate instruction pipeline activity
Request interrupt service from the CPU
IRQ[7:1]
Master In Slave Out
MISO
Serial input to QSPI in master mode;
serial output from QSPI in slave mode
Selects system clock source
Serial output from QSPI in master mode;
serial input to QSPI in slave mode
SIML digital output signals
QSPI peripheral chip selects
Clock Mode Select
MODCLK
Master Out Slave In
MOSI
Port C
PC[6:0]
Peripheral Chip
Select
Port E
Port F
Port QS
Quotient Out
Reset
Read-Modify-Write
Cycle
Read/Write
SCI Receive Data
PCS[3:0]
PE[7:0]
PF[7:0]
PQS[7:0]
QUOT
RESET
SIML digital input or output port signals
SIML digital input or output port signals
QSM digital I/O port signals
Provides the quotient bit of the polynomial divider
System reset
Indicates an indivisible read-modify-write instruction
RMC
R/W
RXD
Indicates the direction of data transfer on the bus
Serial input to the SCI
Clock output from QSPI in master mode;
clock input to QSPI in slave mode
Indicates the number of bytes to be transferred during a bus cycle
Causes serial transmission when QSPI is in slave mode.
Causes mode fault in master mode
Places all output drivers in a high-impedance state
Serial output from the SCI
Connection for external phase-locked loop filter capacitor
QSPI Serial Clock
SCK
Size
SIZ[1:0]
Slave Select
SS
Three-State Control
SCI Transmit Data
External Filter
Capacitor
TSC
TXD
XFC
Table 6 MCU Signal Function (Continued)
Signal Name
Mnemonic
Function