PD780701Y_15 Datasheet, PDF (31/66 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD780701Y, 780702Y
(2) Serial interfaces SIO30, SIO31
The serial interfaces SIO30 and SIO31 have the 3-wire serial I/O mode.
• 3-wire serial I/O mode (fixed as MSB first)
This is an 8-bit data transfer mode using three lines: serial clock line (SCK3n), serial output line (SO3n), and
serial input line (SI3n).
Since simultaneous transmit and receive operations are available in the 3-wire serial I/O mode, the processing
time for data transfer is reduced.
The first bit in 8-bit data in the serial transfer is fixed as MSB.
The 3-wire serial I/O mode is useful for connection to a peripheral I/O device that includes a clocked serial
interface, a display controller, etc.
Remark n = 0, 1
Figure 4-13. Block Diagram of Serial Interface SIO30
SI30/P30
SO30/P31
SCK30/P32
Internal bus
8
Serial I/O shift
register 30 (SIO30)
Serial
clock counter
Serial clock
control circuit
Interrupt request
signal generator
Selector
INTCSI30
fX/2⁴
fX/2⁵
fX/2⁷
SI31/P20
SO31/P21
SCK31/P22
Figure 4-14. Block Diagram of Serial Interface SIO31
Internal bus
8
Serial I/O shift
register 31 (SIO31)
Serial
clock counter
Serial clock
control circuit
Interrupt request
signal generator
Selector
INTCSI31
fX/2⁴
fX/2⁵
fX/2⁷
Preliminary Product Information U13920EJ1V0PM00
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