HD404369F datasheet(76/117 Pages) RENESAS

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HD404369 Series

Port mode

(PMRC)

SCK

Selector

System

clock

øPER

Prescaler S (PSS)

Idle

controller

Serial mode

(SMR)

Clock

Serial data

Serial interrupt

request flag

(IFS)

1/2

Octal

counter (OC)

I/O

controller

Transfer

control

signal

Figure 58 Serial Interface Block Diagram

Serial Interface Operation

Selecting and Changing the Operating Mode: Table 27 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 the

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

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

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

Pin Setting: The R0

0/SCK pin is controlled by writing data to the serial mode register (SMR: $005). The

1/SI and R0 2/SO pins are controlled by writing data to port mode register A (PMRA: $004). Refer to the

following Registers for Serial Interface section for details.

Transmit Clock Source Setting: The transmit clock source is set by writing data to the serial mode

Interface section for details.

Data Setting: Transmit data is set by writing data to the serial data register (SRL: $006, SRU, $007).

Receive data is obtained by reading the contents of the serial data register. The serial data is shifted by the

transmit clock and is input from or output to an external system.

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