mc68hc908kx8 Freescale Semiconductor, Inc, mc68hc908kx8 Datasheet - Page 110

• Manufacturer Part Number: mc68hc908kx8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Input/Output (I/O) Ports (PORTS)
When bit DDRBx is a 1, reading address $0001 reads the PTBx data latch. When bit DDRBx is a 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.
110
1. Writing affects data register, but does not affect input.
DDRB
X = Don’t care
Hi-Z = High impedance
Bit
0
1
PTB
Bit
X
X
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
Input, Hi-Z
I/O Pin
Output
Mode
Table 11-2. Port B Pin Functions
Accesses to DDRB
DDRB7–DDRB0
DDRB7–DDRB0
Read/Write
Table 11-2
summarizes the operation of the port B pins.
PTB7–PTB0
Read
Pin
Accesses to PTB
PTB7–PTB0
PTB7–PTB0
Freescale Semiconductor
Write
(1)