Port D - Freescale Semiconductor MC68HC08KH12 Datasheet

12.6 Port D

Advance Information
192
READ DDRC ($0006)
WRITE DDRC ($0006)
RESET
WRITE PTC ($0002)
READ PTC ($0002)
Figure 12-9. Port C I/O Circuit
When bit DDRCx is a logic one, reading address $0002 reads the PTCx
data latch. When bit DDRCx is a logic zero, reading address $0002
reads the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit.
the operation of the port C pins.
Table 12-4. Port C Pin Functions
DDRC
PTC Bit I/O Pin Mode
Bit
(1)
0 X Input, Hi-Z
1 X
1. X = don't care
2. Hi-Z = high impedance
3. Writing affects data register, but does not affect input.
Port D is an 8-bit general-purpose bidirectional I/O port that shares its
pins with the keyboard interrupt module (KBI). All Port D pins have built-
in schmitt triggered input.
DDRCx
PTCx
Accesses to
DDRC
Read/Write
(2)
DDRC[4:0]
Output DDRC[4:0]
PTCx
Table 12-4 summarizes
Accesses to PTC
Read Write
Pin PTC[4:0]
PTC[4:0] PTC[4:0]
MC68HC(7)08KH12 Rev. 1.1
—
Freescale Semiconductor
(3)