MC68HC908GP32 Datasheet, PDF (223/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
Input/Output (I/O) Ports
Port B
When bit DDRBx is a logic 1, reading address $0001 reads the PTBx
data latch. When bit DDRBx is a logic 0, reading address $0001 reads
the voltage level on the pin. The data latch can always be written,
regardless of the state of its data direction bit. Table 16-3 summarizes
the operation of the port B pins.
Table 16-3. Port B Pin Functions
DDRB Bit PTB Bit
I/O Pin Mode
Accesses
to DDRB
Read/Write
0
X⁽¹⁾
Input, Hi-Z⁽²⁾
DDRB7–DDRB0
1
X
Output
DDRB7–DDRB0
Notes:
1. X = Don’t care
2. Hi-Z = High impedance
3. Writing affects data register, but does not affect input.
Accesses to PTB
Read
Pin
PTB7–PTB0
Write
PTB7–PTB0⁽³⁾
PTB7–PTB0
MC68HC908GP32•MC68HC08GP32 — Rev. 6
MOTOROLA
Input/Output (I/O) Ports
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Technical Data
221