
10-25
ML63326 User's Manual
Chapter 10 Ports (INPUT, OUTPUT, I/O PORT)
10
10.6.2 Port B Registers
(1) Port B direction register (PBDIR)
PBDIR is a 4-bit special function register (SFR) which specifies the port input/output direction
for each bit. Pins corresponding to PBDIR bits set to "0" are input, and those corresponding
to bits set to "1" are output.
At system reset the port B direction register is set to "0", and port B is initialized to input mode.
PB3DIR
PB2DIR
PB1DIR
PB0DIR
PBDIR (030H)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port B input/output setting
0: Input (initial value)
1: Output
(2) Port B data register (PBD)
PBD is a 4-bit special function register used to set the output values for port B.
When the port B data register is read during the output mode, the content of the PBD is read.
The port B pin levels are read when the port B data register is read with the port B direction
register bits set to "0" and the input mode selected.
PB3
PB2
PB1
PB0
PBD (00BH)
(R/W)
bit 3
bit 2
bit 1
bit 0
Port B output data
At system reset the port B data register (PBD) is set to "0". When data is written to the port
B data register, the actual pin change timing is at the rising edge of the system clock for state
2 of the write instruction.
Figure 10-9 indicates port change timing.
S1
S2
Old data
New data
CLK
Port B
Write instruction
Figure 10-9 Port B Change Timing
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