MC68HC08LT8 Datasheet, PDF (96/156 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
Table 9-1. Port Control Register Bits Summary (Sheet 2 of 2)
Port
Bit
0
1
2
3
E
4
5
6
7
DDR
DDRE0
DDRE1
DDRE2
DDRE3
DDRE4
DDRE5
DDRE6
DDRE7
Module
Module Control
Register
Control Bit
LCD
CONFIG2 ($001D)
LCDCR ($0051)
PEE
LCDE
1. Pins not available on 44-pin package.
Pin
PTE0/FP3
PTE1/FP4
PTE2/FP5
PTE3/FP6
PTE4/FP7
PTE5/FP8
PTE6/FP9
PTE7/FP10
9.2 Port A
Port A is an 8-bit special function port that shares four of its port pins with the keyboard interrupt module
(KBI).
9.2.1 Port A Data Register (PTA)
The port A data register contains a data latch for each of the eight port A pins.
Address: $0000
Bit 7
6
5
4
3
2
1
Bit 0
Read:
PTA7
Write:
PTA6
PTA5
PTA4
PTA3
PTA2
PTA1
PTA0
Reset:
Unaffected by Reset
Alternative Function:
KBI3
KBI2
KBI1
KBI0
Figure 9-2. Port A Data Register (PTA)
PTA[7:0] — Port A Data Bits
These read/write bits are software programmable. Data direction of each port A pin is under the control
of the corresponding bit in data direction register A. Reset has no effect on port A data.
KBI[3:0] — Keyboard Interrupt Channels 3 to 0
KBI[3:0] are pins used for the keyboard interrupt input. The corresponding input, KBI[3:0], can be
enabled in the keyboard interrupt enable register, KBIER. Port pins used as KBI input will override any
control from the port I/O logic. See Section 20. Keyboard Interrupt Module (KBI).
MC68HC08LT8 Data Sheet, Rev. 1
96
Freescale Semiconductor