UPD17708 datasheet(99/356 Pages) NEC

Part #	UPD17708

Description	4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM

PDF	356 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

Logo

99 / 356 page

µPD17704, 17705, 17707, 17708, 17709

11.2 General-Purpose I/O Port (P0A, P0B, P0C, P1D, P2A, P2B, P2C, P2D, P3A, P3B, P3C, P3D)

11.2.1 Configuration of I/O port

The following paragraphs (1) and (2) show the configuration of the I/O ports.

(1) P0A (P0A1, P0A0)

P0B (P0B3, P0B2, P0B1, P0B0)

P0C (P0C3, P0C2, P0C1, P0C0)

P1D (P1D3, P1D2, P1D1, P1D0)

P2A (P2A2, P2A1, P2A0)

P2B (P2B3, P2B2, P2B1, P2B0)

P2C (P2C3, P2C2, P2C1, P2C0)

P2D (P2D2, P2D1, P2D0)

P3A (P3A3, P3A2, P3A1, P3A0)

P3B (P3B3, P3B2, P3B1, P3B0)

P3C (P3C3, P3C2, P3C1, P3C0)

P3D (P3D3, P3D2, P3D1, P3D0)

Note

This is an internal signal that is output when the clock stop instruction is executed, and this circuit

is designed not to increase the current consumption due to noise even if it is floated.

VDD

I/O selection flag

Output latch

Read instruction

Port register

(1 bit)

Write instruction

CKSTOP Note

UPD17708 Datasheet(PDF) 99 Page - NEC