UPD17708 datasheet(100/356 Pages) NEC

Il numero della parte	UPD17708

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

PDF	356 Pages

Scroll/Zoom	100%

Produttore elettronici	NEC [NEC]

Homepage	http://www.nec.com/

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100 / 356 page

µPD17704, 17705, 17707, 17708, 17709

100

(2) P0A (P0A3, P0A2)

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.

11.2.2 Using I/O port

The input or output mode of the I/O ports is set by I/O selection register P0A, P0B, P0C, P1D, P2A, P2B,

P2C, P2D, P3A, P3B, P3C, or P3D of the control registers.

Because P0A, P0B, P0C, P1D, P2A, P2B, P2C, and P2D are bit I/O ports, they can be set in the input or output

mode in 1-bit units.

P3A, P3B, P3C, and P3D are group I/O ports, and therefore they are set in the input or output mode in 4-

bit units.

Setting the output data of or reading the input data of a port is carried out by executing an instruction that

writes data to or reads data from the port.

11.2.3 shows the configuration of the I/O selection register of each port.

11.2.4 and 11.2.5 describe how each port is used as an input or output port.

11.2.6 describes the points to be noted when using the I/O ports.

VDD

I/O selection flag

Output latch

Read instruction

Port register

(1 bit)

Write instruction

CKSTOP Note

UPD17708 Scheda tecnica(PDF) 100 Page - NEC