mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 115

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

12.2 Port A
Port A is an 4-bit special-function port that shares all four of its pins with the keyboard interrupt (KBI)
module. Port A also has software configurable pullup devices if configured as an input port.
12.2.1 Port A Data Register
The port A data register (PTA) contains a data latch for each of the four port A pins.
Freescale Semiconductor
Alternative
Function:
Address:
Port
Reset:
Read:
Write:
A
B
C
D
E
$0000
Bit 7
Bit
0
1
2
3
0
1
2
3
4
5
0
1
0
1
2
3
4
5
6
0
1
0
Table 12-1. Port Control Register Bits Summary
= Unimplemented
Figure 12-2. Port A Data Register (PTA)
DDRA0
DDRA1
DDRA2
DDRA3
DDRB0
DDRB1
DDRB2
DDRB3
DDRB4
DDRB5
DDRC0
DDRC1
DDRD0
DDRD1
DDRD2
DDRD3
DDRD4
DDRD5
DDRD6
DDRE0
DDRE1
DDR
6
0
MC68HC908GR8B Data Sheet, Rev. 3.0
5
0
TIM1
TIM2
KBD
ADC
SPI
SCI
Module Control
Unaffected by reset
4
0
ELS0B:ELS0A
ELS1B:ELS1A
ELS0B:ELS0A
ADCH4:0
ADCH4:0
ADCH4:0
ADCH4:0
ADCH4:0
ADCH4:0
KBD3
PTA3
ENSCI
KBIE0
KBIE1
KBIE2
KBIE3
3
SPE
KBD2
PTA2
2
PTD3/SPSCK
PTD4/T1CH0
PTD5/T1CH1
PTD6/T2CH0
PTD1/MISO
PTD2/MOSI
PTA0/KBD0
PTA1/KBD1
PTA2/KBD2
PTA3/KBD3
PTB0/AD0
PTB1/AD1
PTB2/AD2
PTB3/AD3
PTB4/AD4
PTB5/AD5
PTE1/RxD
KBD1
PTE0/TxD
PTA1
PTD0/SS
1
PTC0
PTC1
Pin
KBD0
PTA0
Bit 0
Port A
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