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8.7
Port B
8.7.1
Overview
Port B is an 8-bit I/O port. Port B has an address bus output function, and the pin functions change
according to the operating mode.
Port B has a built-in MOS input pull-up function that can be controlled by software.
Figure 8-9 shows the port B pin configuration.
Port B
Pin functions in mode 6*
PB7 (input) / A15 (output)
PB6 (input) / A14 (output)
PB5 (input) / A13 (output)
PB4 (input) / A12 (output)
PB3 (input) / A11 (output)
PB2 (input) / A10 (output)
PB1 (input) / A9 (output)
PB0 (input) / A8 (output)
Note: * Modes 6 and 7 are not available in the ROMless versions.
Rev. 5.00, 12/03, page 254 of 1088
Port B pins
PB7 / A15
PB6 / A14
PB5 / A13
PB4 / A12
PB3 / A11
PB2 / A10
PB1 / A9
PB0 / A8
Figure 8-9 Port B Pin Functions
Pin functions in modes 4 and 5
A15 (output)
A14 (output)
A13 (output)
A12 (output)
A11 (output)
A10 (output)
A9 (output)
A8 (output)
Pin functions in mode 7*
PB7 (I/O)
PB6 (I/O)
PB5 (I/O)
PB4 (I/O)
PB3 (I/O)
PB2 (I/O)
PB1 (I/O)
PB0 (I/O)
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