upd78f0103 Renesas Electronics Corporation., upd78f0103 Datasheet - Page 268

• Manufacturer Part Number: upd78f0103
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(1) Transmit buffer register 10 (SOTB10)
(2) Serial I/O shift register 10 (SIO10)
268
SI10/P11(/RxD0
Note
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).
SCK10/P10
(/TxD0
PD780102, 780103, 78F0103 only.
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Note
X
X
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X
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X
Note
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X
/2
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Transmit data
controller
Figure 13-1. Block Diagram of Serial Interface CSI10
Serial I/O shift
register 10 (SIO10)
Clock start/stop controller &
CHAPTER 13 SERIAL INTERFACE CSI10
clock phase controller
8
Transmit controller
Internal bus
User’s Manual U15836EJ5V0UD
Output latch
Transmit buffer
register 10 (SOTB10)
8
selector
Output
INTCSI10
Output latch
(P12)
PM12
SO10/P12