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 the table MCU Driver Types for a description of output drivers. An entry in the discrete
I/O column of the MCU Pin Characteristics table 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]
AN[6:0]
AS
AVEC
BERR2
BG/CS1
BGACK/CS2
BKPT/DSCLK
BR/CS0
CLKOUT
CSBOOT
DATA[15:0]1
DS
DSACK1
DSACK0
DSI/IFETCH
DSO/IPIPE
EXTAL3
FC[2:0]/CS[5:3]
FREEZE/QUOT
HALT2
IRQ[7:1]
MODCLK1
R/W
RESET
RMC
SIZ[1:0]
TPUCH[15:0]
TSC
T2CLK
VRH4
VRL4
XFC3
XTAL3
R/W
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
Bo
B
B
A
Bo
B
B
A
—
A
—
—
—
—
A
Input
Synchronized
Y
Y
Y
Y1
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
Y
N
N
N
—
N
Y
N
—
—
N
N
N
N
Y
—
—
—
—
N
Y
N
N
Y
N
N
Y
Y
Y
—
—
—
—
N
Discrete
I/O
—
O
—
I
I/O
I/O
—
—
—
—
—
—
—
—
I/O
I/O
I/O
—
—
—
O
—
—
I/O
I/O
—
—
I/O
I/O
—
—
—
—
—
—
—
—
Port
Designation
—
PC[6:3]
—
PADA[6:0]
PE5
PE2
—
—
—
—
—
—
—
—
PE4
PE1
PE0
—
—
—
PC[2:0]
—
—
PF[7:1]
PF0
—
—
PE3
PE[7:6]
—
—
—
—
—
—
—
—
MC68334
MC68334TS/D
7