MC68HC908MR8 Datasheet, PDF (284/372 Pages) Motorola, Inc – Microcontrollers

Input/Output (I/O) Ports
14.4 Port B
Port B is a 7-bit general-purpose bidirectional I/O port that shares its pins
with the serial communications interface (SCI) module.
14.4.1 Port B Data Register
The port B data register (PTB) contains a data latch for each of the eight
port B pins.
Ad-
dress:
$0001
Bit 7
6
5
4
3
2
1
Read:
Write:
PTB6 PTB5 PTB4 PTB3 PTB2 PTB1
Reset:
Unaffected by reset
= Unimplemented
Figure 14-5. Port B Data Register (PTB)
Bit 0
PTB0
PTB[6:0] — Port B Data Bits
These read/write bits are software-programmable. Data direction of
each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
Technical Data
284
Input/Output (I/O) Ports
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor