MC68HC912BD32CFU10 FREESCALE [Freescale Semiconductor, Inc], MC68HC912BD32CFU10 Datasheet - Page 63

• Manufacturer Part Number: MC68HC912BD32CFU10
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

PEAR — Port E Assignment Register
DDRE — Port E Data Direction Register
5-bus
RESET:
RESET:
RESET:
RESET:
RESET:
RESET:
NDBE
Bit 7
0
0
1
1
0
DDE7
Bit 7
0
6
0
–
–
–
–
–
This register is not in the map in peripheral mode or expanded modes
when the EME bit is set.
Read and write anytime.
DDE6
This register determines the primary direction for each port E pin
configured as general-purpose I/O.
PE[1:0] are associated with XIRQ and IRQ and cannot be configured as
outputs. These pins can be read regardless of whether the alternate
interrupt functions are enabled.
This register is not in the map in peripheral mode and expanded modes
while the EME control bit is set.
Read and write anytime.
The PEAR register is used to choose between the general-purpose I/O
functions and the alternate bus control functions of port E. When an
6
0
Freescale Semiconductor, Inc.
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PIPOE
0 = Associated pin is a high-impedance input
1 = Associated pin is an output
5
0
1
0
0
1
DDE5
Bus Control and Input/Output
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5
0
NECLK
4
0
0
1
1
0
DDE4
4
0
LSTRE
3
0
1
0
0
1
DDE3
3
0
RDWE
2
0
1
0
0
1
DDE2
2
0
1
0
–
–
–
–
–
Bus Control and Input/Output
MC68HC912BD32 Rev 1.0
Bit 0
1
0
–
0
–
–
–
–
–
Single Chip
Single Chip
Expanded
Expanded
Peripheral
Special
Special
Registers
Normal
Normal
$000A
Bit 0
$0009
0
–