HD404344R Datasheet, PDF (63/102 Pages) Renesas Technology Corp – 4-bit microcomputer has an A/D converter

HD404344R Series/HD404394 Series
Serial Interface
The MCU has a one-channel 8-bit serial interface built in with the following features.
• One of 12 different internal clocks or an external clock can be selected as the transmit clock. The
internal clocks include the six prescaler outputs divided by two and by four, and the system clock.
• During idle states, the serial output pin can be controlled as high or low output.
• Transmit clock errors can be detected.
• An interrupt request can be generated when any errors occurred or data transfer has completed.
SO
SCK
SI
Idle
controller
I/O
controller
Octal
counter (OC)
Clock
1/2
1/2
Serial interrupt
request flag
(IFS)
Serial data
register (SR)
Transfer
control
signal
System
clock
ø_PER
Selector
3
Serial mode
register
(SMR)
Prescaler S (PSS)
Port mode
register C
(PMRC)
Figure 41 Serial Interface Block Diagram
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