MC68331 Datasheet, PDF (9/84 Pages) Motorola, Inc – User’s Manual

Freescale Semiconductor, Inc.
2 Signal Descriptions
2.1 Pin Characteristics
The following table shows MCU pins and their characteristics. All inputs detect CMOS logic levels. All
inputs can be put in a high-impedance state, but the method of doing this differs depending upon pin
function. Refer to Table 4, for a description of output drivers. An entry in the discrete I/O column of Ta-
ble 2 indicates that a pin has an alternate I/O function. The port designation is given when it applies.
Refer to the MCU Block Diagram for information about port organization.
Pin
Mnemonic
ADDR23/CS10/ECLK
ADDR[22:19]/CS[9:6]
ADDR[18:0]
AS
AVEC
BERR
BG/CS1
BGACK/CS2
BKPT/DSCLK
BR/CS0
CLKOUT
CSBOOT
DATA[15:0]¹
DS
DSACK1
DSACK0
DSI/IFETCH
DSO/IPIPE
EXTAL²
FC[2:0]/CS[5:3]
FREEZE/QUOT
IC4/OC5
IC[3:1]
HALT
IRQ[7:1]
MISO
MODCLK¹
MOSI
OC[4:1]
PAI³
PCLK³
PCS0/SS
PCS[3:1]
PWMA, PWMB
R/W
RESET
RMC
Table 2 MCU Pin Characteristics
Output
Driver
A
A
A
B
B
B
B
B
—
B
A
B
Aw
B
B
B
A
A
—
A
A
A
A
Bo
B
Bo
B
Bo
A
—
—
Bo
Bo
A
A
Bo
B
Input
Synchronized
Y
Y
Y
Y
Y
Y
—
Y
Y
Y
—
—
Y
Y
Y
Y
Y
—
—
Y
—
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
—
Y
Y
Y
Input
Hysteresis
N
N
N
N
N
N
—
N
Y
N
—
—
N
N
N
N
Y
—
Special
N
—
Y
Y
N
Y
Y
N
Y
Y
Y
Y
Y
Y
—
N
Y
N
Discrete
I/O
O
O
—
I/O
I/O
—
—
—
—
—
—
—
—
I/O
I/O
I/O
—
—
—
O
—
I/O
I/O
—
I/O
I/O
I/O
I/O
I/O
I
I
I/O
I/O
O
—
—
I/O
Port
Designation
—
PC[6:3]
—
PE5
PE2
—
—
—
—
—
—
—
—
PE4
PE1
PE0
—
—
—
PC[2:0]
—
GP4
GP[7:5]
—
PF[7:1]
PQS0
PF0
PQS1
GP[3:0]
—
—
PQS3
PQS[6:4]
—
—
—
PE3
MC68331TS/D
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