HD404814FS datasheet(58/100 Pages) RENESAS

58 / 100 page

HD404818 Series

Serial Interface

The serial interface transmits/receives 8-bit data serially. It consists of the serial data register, the serial

mode register, port mode register A, the octal counter, and the selector (figure 29). Pin R0

0/SCK and the

transmit clock signal are controlled by the serial mode register. The data of the serial data register can be

written and read by software. The data in the serial data register can be shifted synchronously with the

transmit clock signal.

The STS instruction starts serial interface operations and resets the octal counter to $0. The octal counter

starts to count at the falling edge of the transmit clock signal (

SCK) and increments by one at the rising

edge of the

SCK. When the octal counter is reset to $0 after eight transmit clock signals, or when a

transmit/receive operation is discontinued by resetting the octal counter, the serial interrupt request flag will

be set.

Port mode

(PMRA)

SCK

Selector

System

clock

Prescaler S (PSS)

I/O

control

logic

Serial mode

(SMR)

Clock

Serial data

Serial interrupt

request flag

(IFS)

1/2

Octal

counter (OC)

I/O

control

logic

Transfer

control

signal

fcyc/fsub

(tcyc/tsubcyc)

Figure 29 Serial Interface Block Diagram

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