upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 307

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) Transmit buffer register 10 (SOTB10)
(2) Serial I/O shift register 10 (SIO10)
SCK10/P10/TxD0
SI10/P11/R
This register sets the transmit data.
Transmission/reception is started by writing data to SOTB10 when bit 7 (CSIE10) and bit 6 (TRMD10) of serial
operation mode register 10 (CSIM10) are 1.
The data written to SOTB10 is converted from parallel data into serial data by serial I/O shift register 10, and
output to the serial output pin (SO10).
SOTB10 can be written or read by an 8-bit memory manipulation instruction.
RESET input makes this register undefined.
Caution Do not access SOTB10 when CSOT10 = 1 (during serial communication).
This is an 8-bit register that converts data from parallel data into serial data and vice versa.
This register can be read by an 8-bit memory manipulation instruction.
Reception is started by reading data from SIO10 if bit 6 (TRMD10) of serial operation mode register 10 (CSIM10)
is 0.
During reception, the data is read from the serial input pin (SI10) to SIO10.
RESET input clears this register to 00H.
Caution Do not access SIO10 when CSOT10 = 1 (during serial communication).
f
f
f
f
f
f
X
X
X
X
X
X
X
f
X
/2
/2
/2
/2
/2
/2
D0
/2
2
3
4
5
6
7
Transmit data
controller
Serial I/O shift
register 10 (SIO10)
Figure 15-1. Block Diagram of Serial Interface CSI10
Clock start/stop controller &
clock phase controller
CHAPTER 15 SERIAL INTERFACE CSI10
8
Transmit controller
Internal bus
Output latch
User’s Manual U16962EJ3V0UD
Transmit buffer
register 10 (SOTB10)
8
selector
Output
INTCSI10
Output latch
(P12)
PM12
SO10/P12
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