MC68HC708MP16 Datasheet, PDF (318/398 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
15.2 Introduction
Thirty-seven bidirectional input-output (I/O) pins and seven input pins
form eight parallel ports. All I/O pins are programmable as inputs or
outputs.
NOTE:
Connect any unused I/O pins to an appropriate logic level, either V_DD or
V_SS. Although the I/O ports do not require termination for proper
operation, termination reduces excess current consumption and the
possibility of electrostatic damage.
Addr.
$0000
$0001
$0002
$0003
$0004
$0005
Name
Bit 7
Read:
Port A Data Register
(PTA)
Write:
Reset:
PTA7
6
PTA6
5
PTA5
4
3
PTA4 PTA3
Unaffected by reset
Read:
Port B Data Register
(PTB)
Write:
Reset:
PTB7
PTB6
PTB5
PTB4 PTB3
Unaffected by reset
Read: 0
Port C Data Register
(PTC)
Write:
Reset:
PTC6 PTC5 PTC4 PTC3
Unaffected by reset
Read: 0
Port D Data Register
(PTD)
Write:
Reset:
PTD6 PTD5 PTD4 PTD3
Unaffected by reset
Read:
Port E Data Register
(PTE)
Write:
Reset:
PTE7
PTE6
PTE5
PTE4 PTE3
Unaffected by reset
Read: 0
Port F Data Register
(PTF)
Write:
Reset:
0
PTF5 PTF4
PTF3
Unaffected by reset
= Unimplemented
Figure 15-1. I/O Port Register Summary
2
PTA2
PTB2
PTC2
PTD2
PTE2
PTF2
1
PTA1
PTB1
PTC1
PTD1
PTE1
PTF1
Bit 0
PTA0
PTB0
PTC0
PTD0
PTE0
PTF0
Technical Data
318
Input/Output (I/O) Ports
MC68HC708MP16 — Rev. 3.1
Freescale Semiconductor