HD6473032F Datasheet, PDF (176/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

7.11 Port B
7.11.1 Overview
Port B is an 8-bit input/output port that is also used for TPC output (TP₁₅ to TP₈), ITU input/output
(TIOCB₄, TIOCB₃, TIOCA₄, TIOCA₃) and ITU output (TOCXB₄, TOCXA₄), and ADTRG input
to the A/D converter. Port B has the same set of pin functions in all operating modes. Figure 7-20
shows the pin configuration of port B.
Pins in port B can drive one TTL load and a 30-pF capacitive load. They can also drive a darlington
transistor pair. Pins PB₃ to PB₀ have Schmitt-trigger inputs.
Port B
Port B pins
PB ₇ (input/output)/TP₁₅ (output)/ADTRG (input)
PB ₆ (input/output)/TP₁₄ (output)
PB ₅ (input/output)/TP₁₃ (output)/TOCXB₄ (output)
PB ₄ (input/output)/TP₁₂ (output)/TOCXA₄ (output)
PB ₃ (input/output)/TP₁₁ (output)/TIOCB₄ (input/output)
PB ₂ (input/output)/TP₁₀ (output)/TIOCA₄ (input/output)
PB ₁ (input/output)/TP₉ (output)/TIOCB₃ (input/output)
PB ₀ (input/output)/TP₈ (output)/TIOCA₃ (input/output)
Figure 7-20 Port B Pin Configuration
7.11.2 Register Descriptions
Table 7-17 summarizes the registers of port B.
Table 7-17 Port B Registers
Address* Name
H'FFD4
Port B data direction register
H'FFD6
Port B data register
Note: * Lower 16 bits of the address.
Abbreviation R/W
PBDDR
W
PBDR
R/W
Initial Value
H'00
H'00
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