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Rev. 5.00, 09/03, page 590 of 760
19.3.2 Port B Data Register (PBDR)
Bit:76543210
PB7DT PB6DT PB5DT PB4DT PB3DT PB2DT PB1DT PB0DT
Initial value:00000000
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
The port B data register (PBDR) is an 8-bit readable/writable register that stores data for pins
PTB7 to PTB0. Bits PB7DT to PB0DT correspond to pins PTB7 to PTB0. When the pin function
is general output port, if the port is read the value of the corresponding PBDR bit is returned
directly. When the function is general input port, if the port is read the corresponding pin level is
read. Table 19.4 shows the function of PBDR.
PBDR is initialized to H'00 by a power-on reset. It retains its previous value in standby mode and
sleep mode, and in a manual reset.
Table 19.4 Port B Data Register (PBDR) Read/Write Operations
PBnMD1 PBnMD0 Pin State Read Write
0 0 Other function
(See table 18.1)
PBDR value Value is written to PBDR, but does not
affect pin state
1 Output PBDR value Write value is output from pin
1 0 Input (Pull-up
MOS on)
Pin state Value is written to PBDR, but does not
affect pin state
1 Input (Pull-up
MOS off)
Pin state Value is written to PBDR, but does not
affect pin state
(n = 7 to 0)