MC68HC908LD64 Datasheet, PDF (300/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Input/Output (I/O) Ports
19.4 Port B
Port B is an 8-bit special-function port that shares all eight of its pins with
the pulse width modulator (PWM). (See Section 12. Pulse Width
Modulator (PWM).)
19.4.1 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
Read:
PTB7
Write:
PTB6
PTB5
PTB4
PTB3
PTB2
Reset:
Unaffected by reset
Alternative Function: PWM7 PWM6 PWM5 PWM4 PWM3 PWM2
Figure 19-6. Port B Data Register (PTB)
1
PTB1
PWM1
Bit 0
PTB0
PWM0
PTB[7:0] — 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.
PWM[7:0] — PWM Outputs Pins
The PWM output enable bits PWM7E–PWM0E, in the PWM control
register (PWMCR) enable port B pins as PWM output pins. (See
19.4.3 Port B Options and Section 12. Pulse Width Modulator
(PWM).)
Data Sheet
300
Input/Output (I/O) Ports
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor