7733 datasheet(824/940 Pages) RENESAS

824 / 940 page

7736 Group User’s Manual

3–2

PROGRAMMABLE I/O PORTS

Functions of all ports in the single-chip mode and those of ports P43 to P47 and P5 to P10 in the memory

expansion or the microprocessor mode are described below. For more information about ports P0 to P4,

whose functions depend on the processor mode, refer to section “2.5 Processor modes” and chapter “12.

CONNECTING EXTERNAL DEVICES.”

3.1 Programmable I/O ports and Output-only ports

The 7736 Group has 76 programmable I/O ports (P0 to P8 and P10) and 8 output-only ports (P9).

Each of programmable I/O ports has a port direction register and a port register in the SFR area. Each

output-only port has a port register in the SFR area. Figure 3.1.1 shows the memory map of port direction

registers and port registers.

Note that ports P42, P5 to P8, P90 to P93 and P104 to P107 also function as I/O pins for internal peripheral

devices. For details, refer to section “3.4 Internal peripheral devices’ I/O functions” and the corresponding

functional description.

3.1 Programmable I/O ports and Output-only ports

Port P4 register

Port P5 register

Port P4 direction register

Port P5 direction register

Port P6 register

Port P7 register

Port P6 direction register

Port P7 direction register

Port P8 register

Port P8 direction register

816

916

A16

B16

C16

D16

E16

F16

1016

1116

1216

1316

1416

addresses

Port P0 register

Port P1 register

Port P0 direction register

Port P1 direction register

Port P2 register

Port P3 register

Port P2 direction register

Port P3 direction register

216

316

416

516

616

716

Port P9 register

Port P10 register

Port P10 direction register

1516

1616

1716

1816

Fig. 3.1.1 Memory map of port direction registers and port registers

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