MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 153

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

11.2 Port A
Port A is an 8-bit special function port that shares all of its pins with the keyboard interrupt (KBI) module
(see
device if the corresponding port pin is configured as input port. PTA0–PTA5 and PTA7 has direct LED
drive capability.
11.2.1 Port A Data Register (PTA)
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
KBI7–KBI0 — Port A Keyboard Interrupts
11.2.2 Data Direction Register A (DDRA)
Data direction register A determines whether each port A pin is an input or an output. Writing a logic 1 to
a DDRA bit enables the output buffer for the corresponding port A pin; a logic 0 disables the output buffer.
Freescale Semiconductor
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 control register (KBIER) enable
the port A pins as external interrupt pins, (see
Chapter 13 Keyboard Interrupt Module
Alternative Functions:
Additional Functions:
PTA0–PTA5 pins are available on 28-pin and 32-pin packages only.
PTA7 pin is available on 32-pin packages only.
For those devices packaged in a 28-pin package, PTA7 is not connected.
DDRA7 should be set to a 1 to configure PTA7 as an output.
For those devices packaged in a 20-pin package, PTA0–PTA5 and PTA7
are not connected. DDRA0–DDRA5 and DDRA7 should be set to a 1 to
configure PTA0–PTA5 and PTA7 as outputs.
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
Address:
Reset:
Read:
Write:
Keyboard
Interrupt
pull-up
$0000
(Sink)
PTA7
Bit 7
LED
Figure 11-2. Port A Data Register (PTA)
Keyboard
Interrupt
pull-up
PTA6
6
(KBI)). Each port A pin also has software configurable pull-up
Keyboard
Interrupt
pull-up
(Sink)
PTA5
LED
5
NOTE
NOTE
Chapter 13 Keyboard Interrupt Module
Keyboard
Interrupt
Unaffected by Reset
pull-up
(Sink)
PTA4
LED
4
Keyboard
Interrupt
pull-up
(Sink)
PTA3
LED
3
Keyboard
Interrupt
pull-up
(Sink)
PTA2
LED
2
Keyboard
Interrupt
pull-up
(Sink)
PTA1
LED
1
Keyboard
(KBI)).
Interrupt
pull-up
(Sink)
PTA0
Bit 0
LED
Port A
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