mc68hc908ld60 Freescale Semiconductor, Inc, mc68hc908ld60 Datasheet - Page 235

• Manufacturer Part Number: mc68hc908ld60
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

17.3 Port A
17.3.1 Port A Data Register
MC68HC908LD60
Freescale Semiconductor
Alternative Function:
—
Rev. 1.1
Address:
Port A is an 8-bit special-function port that shares all eight of its pins with
the keyboard interrupt module (KBI). (See
Interrupt Module
The port A data register (PTA) contains a data latch for each of the eight
port A pins.
PTA[7:0] — Port A Data Bits
KBI[7:0] — Keyboard Interrupt Pins
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 keyboard interrupt enable bits, KBIE[7:0], in the keyboard
interrupt enable register (KBIER), enable the port A pins as external
interrupt pins. (See
Keyboard Interrupt Module
$0000
PTA7
KBI7
Bit 7
Figure 17-2. Port A Data Register (PTA)
Input/Output (I/O) Ports
PTA6
KBI6
6
(KBI).)
17.3.3 Port A Options
PTA5
KBI5
5
Unaffected by Reset
(KBI).)
PTA4
KBI4
4
PTA3
KBI3
3
Section 19. Keyboard
and
PTA2
KBI2
Section 19.
2
Input/Output (I/O) Ports
PTA1
KBI1
1
Technical Data
PTA0
KBI0
Bit 0
Port A
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