HD4048412FS datasheet(82/127 Pages) RENESAS

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HD404849 Series

Serial mode

(SMRB)

SCK

Selector

System

clock

øPER

Prescaler S (PSS)

Idle

controller

Serial mode

(SMRA)

Clock

Serial data

Serial interrupt

request flag

(IFS)

1/2

Octal

counter (OC)

I/O

controller

Transfer

control

signal

Figure 66 Block Diagram of Serial Interface

Serial Interface Operation

Selecting and Changing the Operating Mode: Table 28 lists the serial interface’s operating modes. To

select an operating mode, use one of these combinations of port mode register A (PMRA: $004) and serial

mode register A (SMRA: $005) settings; to change the operating mode, always initialize the serial interface

internally by writing data to serial mode register A. Note that the serial interface is initialized by writing

data to serial mode register A. Refer to the following Serial Mode Register A section for details.

Table 28 Serial Interface Operating Modes

SMRA

PMRA

Bit 3

Bit 1

Bit 0

Operating Mode

Clock continuous output mode

Transmit mode

Receive mode

Transmit/receive mode

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