MC908AS60ACFU Datasheet, PDF (249/414 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Chapter 22
Input/Output Ports
22.1 Introduction
On the MC68HC908AZ60A and 64-pin MC68HC908AS60A, fifty bidirectional input/output (I/O) form
seven parallel ports. On the52-pin MC68HC908AS60A, forty bidirectional input/output (I/O) form six
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.
Register Name
Bit 7
6
5
4
3
$0000
Port A Data Register (PTA) PTA7
PTA6
PTA5
PTA4
PTA3
$0001
Port B Data Register (PTB) PTB7
PTB6
PTB5
PTB4
PTB3
$0002
Port C Data Register (PTC) 0
0
PTC5
PTC4
PTC3
$0003
Port D Data Register (PTD) PTD7
PTD6
PTD5
PTD4
PTD3
$0004 Data Direction Register A (DDRA) DDRA7 DDRA6 DDRA5 DDRA4 DDRA3
$0005 Data Direction Register B (DDRB) DDRB7 DDRB6 DDRB5 DDRB4 DDRB3
$0006 Data Direction Register C (DDRC) MCLKEN
0
DDRC5 DDRC4 DDRC3
$0007 Data Direction Register D (DDRD) DDRD7 DDRD6 DDRD5 DDRD4 DDRD3
$0008
Port E Data Register (PTE) PTE7
PTE6
PTE5
PTE4
PTE3
$0009
Port F Data Register (PTF) 0
PTF6
PTF5
PTF4
PTF3
$000A
Port G Data Register (PTG) 0
0
0
0
0
$000B
Port H Data Register (PTH) 0
0
0
0
0
$000C Data Direction Register E (DDRE) DDRE7 DDRE6 DDRE5 DDRE4 DDRE3
$000D Data Direction Register F (DDRF) 0
DDRF6 DDRF5 DDRF4 DDRF3
$000E Data Direction Register G (DDRG) 0
0
0
0
0
$000F Data Direction Register H (DDRH) 0
0
0
0
0
Figure 22-1. I/O Port Register Summary
2
PTA2
PTB2
PTC2
PTD2
DDRA2
DDRB2
DDRC2
DDRD2
PTE2
PTF2
PTG2
0
DDRE2
DDRF2
DDRG2
0
1
PTA1
PTB1
PTC1
PTD1
DDRA1
DDRB1
DDRC1
DDRD1
PTE1
PTF1
PTG1
PTH1
DDRE1
DDRF1
DDRG1
DDRH1
Bit 0
PTA0
PTB0
PTC0
PTD0
DDRA0
DDRB0
DDRC0
DDRD0
PTE0
PTF0
PTG0
PTH0
DDRE0
DDRF0
DDRG0
DDRH0
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor
249