MC68HC908BD48 Datasheet, PDF (236/290 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
17.4 Port B
Port B is an 8-bit special-function port that shares all eight of its pins with
the pulse width modulator (PWM).
NOTE: Port pins PTB7–PTB2 are not available in a 28-pin dual in-line package.
17.4.1 Port B Data Register
The port B data register (PTB) contains a data latch for each of the eight
port pins.
Address: $0001
Bit 7
6
5
4
3
2
1
Read:
PTB7
Write:
PTB6
PTB5
PTB4
PTB3
PTB2
PTB1
Reset:
Unaffected by reset
Alternate
Function:
PWM7
PWM6
PWM5
PWM4
PWM3
PWM2
PWM1
Figure 17-5. Port B Data Register (PTB)
Bit 0
PTB0
PWM0
PTB7–PTB0 — 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.
PWM7–PWM0 — PWM Outputs 7–0
The PWM output enable bits PWM7E–PWM0E, in PWM control
register 1 (PWMCR1) enable port B pins as PWM output pins. (See
17.4.3 Port B Options.)
Technical Data
236
Input/Output (I/O) Ports
MC68HC908BD48 — Rev. 1.0
MOTOROLA