
M68HC16 Z SERIES
OVERVIEW
MOTOROLA
USER’S MANUAL
3-11
3.4 Pin Descriptions
The following tables are a summary of the functional characteristics of M68HC16 Z-
series MCU pins. Table 3-1 shows all inputs and outputs. Digital inputs and outputs
use CMOS logic levels. An entry in the “Discrete I/O” column indicates that a pin can
also be used for general-purpose input, output, or both. The I/O port designation is giv-
of output drivers. Table 3-3 shows characteristics of power pins.
Table 3-1 M68HC16 Z-Series Pin Characteristics
Pin
Mnemonic
Output
Driver
Input
Synchronized
Input
Hysteresis
Discrete
I/O
Port
Designation
ADDR23/CS10/ECLK
A
Y
N
O
—
ADDR[22:19]/CS[9:6]
A
Y
N
O
PC[6:3]
ADDR[18:0]
A
Y
N
—
AN[7:0]1
—
Y
N
I
PADA[7:0]
AS
B
Y
I/O
PE5
AVEC
B
Y
N
I/O
PE2
BERR
B
Y
N
—
BG/CS1
B
—
BGACK/CS2
B
Y
N
—
BKPT/DSCLK
—
Y
—
BR/CS0
B
Y
N
O
—
CLKOUT
A
—
CSBOOT
B
—
AW
Y
N
—
DS
B
Y
I/O
PE4
DSACK[1:0]
B
Y
N
I/O
PE[1:0]
DSI/IPIPE1
A
Y
—
DSO/IPIPE0
A
—
EXTAL2
—
Special
—
FC[2:0]/CS[5:3]
A
Y
N
O
PC[2:0]
FREEZE/QUOT
A
—
HALT
Bo
Y
N
—
IC4/OC5
A
Y
I/O
PGP7
IC[3:1]
A
Y
I/O
PGP[2:0]
IRQ[7:1]
B
Y
I/O
PF[7:1]
MISO
Bo
Y
I/O
PQS0
MISO3
Bo
Y
I/O
PMC0
B
Y
N
I/O
PF0
MOSI
Bo
Y
I/O
PQS1
Bo
Y
I/O
PMC1
OC[4:1]
A
Y
I/O
PGP[6:3]
PAI4
—Y
Y
I
—