REGISTER SUMMARY
MC68332
D-8
USER’S MANUAL
D.2.6 PORTE0/PORTE1
— Port E Data Register
$YFFA11, $YFFA13
PORTE is an internal data latch that can be accessed at two locations. PORTE can be
read or written at any time. If a pin in I/O port E is configured as an output, the corre-
sponding bit value is driven out on the pin. When a pin is configured for output, a read
of PORTE returns the latched bit value; when a pin is configured for input, a read re-
turns the pin logic level.
D.2.7 DDRE
— Port E Data Direction Register
$YFFA15
Bits in this register control the direction of the port E pin drivers when pins are config-
ured for I/O. Setting a bit configures the corresponding pin as an output; clearing a bit
configures the corresponding pin as an input. This register can be read or written at
any time.
D.2.8 PEPAR
— Port E Pin Assignment Register
$YFFA17
Bits in this register determine the function of port E pins. Setting a bit assigns the cor-
responding pin to a bus control signal; clearing a bit assigns the pin to I/O port E.
15
8
7
6
5
4
3
2
1
0
NOT USED
PE7
PE6
PE5
PE4
PE3
PE2
PE1
PE0
RESET:
U
U
U
U
U
U
U
U
15
8
7
6
5
4
3
2
1
0
NOT USED
DDE7
DDE6
DDE5
DDE4
DDE3
DDE2
DDE1
DDE0
RESET:
0
0
0
0
0
0
0
0
15
8
7
6
5
4
3
2
1
0
NOT USED
PEPA7
PEPA6
PEPA5
PEPA4
PEPA3
PEPA2
PEPA1
PEPA0
RESET:
DATA8
DATA8
DATA8
DATA8
DATA8
DATA8
DATA8
DATA8
Port E Pin Assignments
PEPAR Bit
Port E Signal
Bus Control Signal
PEPA7
PE7
SIZ1
PEPA6
PE6
SIZ0
PEPA5
PE5
AS
PEPA4
PE4
DS
PEPA3
PE3
RMC
PEPA2
PE2
AVEC
PEPA1
PE1
DSACK1
PEPA0
PE0
DSACK0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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