MC68332
OVERVIEW
USER’S MANUAL
3-7
3.4 Signal Descriptions
The following tables define MCU signals.
shows signal origin, type, and ac-
tive state.
describes signal functions. Both tables are sorted alphabetically
by mnemonic. MCU pins often have multiple functions. More than one description can
apply to a pin.
NOTES:
1. DATA[15:0] are synchronized during reset only. MODCLK is synchronized only when used as an input port pin.
2. EXTAL, XFC, and XTAL are clock reference connections.
TXD
Bo
Y
Y
I/O
PQS7
XFC
2
—
—
—
Special
—
XTAL
2
—
—
—
Special
—
Table 3-3 MCU Power Connections
Pin Mnemonic
Description
V
STBY
Standby RAM Power
V
DDSYN
Clock Synthesizer Power
V
SSE
/V
DDE
External Periphery Power (Source and Drain)
V
SSI
/V
DDI
Internal Module Power (Source and Drain)
Table 3-4 MCU Signal Characteristics
Signal
Name
MCU
Module
Signal
Type
Active
State
ADDR[23:0]
SIM
Bus
—
AS
SIM
Output
0
AVEC
SIM
Input
0
BERR
SIM
Input
0
BG
SIM
Output
0
BGACK
SIM
Input
0
BKPT
CPU32
Input
0
BR
SIM
Input
0
CLKOUT
SIM
Output
—
CS[10:0]
SIM
Output
0
CSBOOT
SIM
Output
0
DATA[15:0]
SIM
Bus
—
DS
SIM
Output
0
DSACK[1:0]
SIM
Input
0
DSCLK
CPU32
Input
Serial Clock
DSI
CPU32
Input
(Serial Data)
DSO
CPU32
Output
(Serial Data)
EXTAL
SIM
Input
—
FC[2:0]
SIM
Output
—
FREEZE
SIM
Output
1
HALT
SIM
Input/Output
0
Table 3-2 MCU Pin Characteristics (Continued)
Pin
Mnemonic
Output
Driver
Input
Synchronized
Input
Hysteresis
Discrete
I/O
Port
Designation
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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