mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 202

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output Ports (I/O)
12.3 Port A
12.3.1 Port A Data Register
Technical Data
202
Additional
Alternativ
Function:
Function:
Address:
Port A is an 8-bit general-purpose bidirectional I/O port with software
configurable pullups, and it shares its pins with the keyboard interrupt
module (KBI).
The port A data register contains a data latch for each of the eight port A
pins.
PTA[7:0] — Port A Data Bits
KBA7–KBA0 — Keyboard Interrupts
Reset:
Read:
Write:
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.
The port A pullup enable bit, PAP, in the port option control register
(POCR) enables pullups on port A pins if the respective pin is
configured as an input. (See
The keyboard interrupt enable bits, KBIE7–KBIE0, in the keyboard
interrupt enable register (KBIER), enable the port A pins as external
interrupt pins. (See
e
Optional
$0000
KBA7
pullup
PTA7
Bit 7
Figure 12-2. Port A Data Register (PTA)
Input/Output Ports (I/O)
Optional
KBA6
pullup
PTA6
6
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Section 14. Keyboard Interrupt Module
Optional
pullup
KBA5
PTA5
5
12.8 Port
Optional
Unaffected by reset
pullup
KBA4
PTA4
4
Optional
pullup
KBA3
PTA3
Options.)
3
Optional
pullup
KBA2
PTA2
Freescale Semiconductor
2
Optional
pullup
KBA1
PTA1
1
Optional
(KBI).)
pullup
KBA0
PTA0
Bit 0