MC68HC08XL36 Datasheet, PDF (291/362 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Input/Output Ports
Port H
Port H
Port H is a 4-bit, general-purpose bidirectional I/O port.
NOTE: Port H is available only on the 64-pin QFP.
Port H Data
Register
PORTH contains the latches for the four port H pins.
Address: $000B
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
0
0
0
PH3
PH2
PH1
PH0
Write:
Reset:
Unaffected by Reset
= Unimplemented
Figure 23. Port H Data Register (PORTH)
PH3–PH0 — Port H Data Bits
These read/write bits are software programmable. Data direction of
each bit is under the control of the corresponding bit in data direction
register H. Reset has no effect on port H data.
Data Direction
Register H
21-ports_a
MOTOROLA
Data direction register H determines whether each port H pin is an input
or an output. Writing a logic 1 to a DDRH bit enables the output buffer
for the corresponding port H pin; a logic 0 disables the output buffer.
Address: $000F
Bit 7
6
5
4
3
2
1
Read: 0
0
0
0
DDRH3 DDRH2 DDRH1
Write:
Reset: 0
0
0
0
0
0
0
= Unimplemented
Figure 24. Data Direction Register H (DDRH)
Bit 0
DDRH0
0
Input/Output Ports
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MC68HC08XL36
291