UPD17708 datasheet(98/358 Pages) RENESAS

98 / 358 page

µPD17704, 17705, 17707, 17708, 17709

11. GENERAL-PURPOSE PORT

The general-purpose ports output high-level, low-level, or floating signals to external circuits, and read high-

level or low-level signals from external circuits.

11.1 Outline of General-purpose Port

Table 11-1 shows the relationships between each port and port register.

The general-prupose ports are classified into I/O, input, and output ports.

The I/O ports are further subclassified into bit I/O ports that can be set in the input or output mode in 1-bit

(1-pin) units, and group I/O ports that can be set in the input or output mode in 4-bit (4-pin) units. The inut or

output mode of each I/O port is specified by the port input/output selection registers (addresses 60H through

6FH) of BANK15.

Table 11-1. Relationships between Port (Pin) and Port Register (1/3)

Port

Data Setting Method

No.

Symbol

I/O

Port register (data memory)

Bank

Address

Symbol

Bit symbol

(reserved word)

Port 0A

P0A3

I/O (bit I/O)

BANK0

70H

P0A

P0A3

P0A2

P0A1

P0A0

Port 0B

P0B3

I/O (bit I/O)

71H

P0B

P0B3

P0B2

P0B1

P0B0

Port 0C

P0C3

I/O (bit I/O)

72H

P0C

P0C3

P0C2

P0C1

P0C0

Port 0D

P0D3

Input

73H

P0D

P0D3

P0D2

P0D1

P0D0

UPD17708 Datasheet(PDF) 98 Page - Renesas Technology Corp

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