RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 388 of 765
Mar 7, 2023
12.3.12 Serial output register m (SOm)
The SOm is a buffer register for serial output of each channel.
The value of the SOmn bit of this register is output from the serial data output pin of channel n.
The value of the CKOmn bit of this register is output from the serial clock output pin of channel n.
The SOmn bit of this register can be rewritten by software only when serial output is disabled (SOEmn = 0). When serial
output is enabled (SOEmn = 1), rewriting by software is ignored, and the value of the register can be changed only by a
serial communication operation.
The CKOmn bit of this register can be rewritten by software only when the channel operation is stopped (SEmn = 0).
While channel operation is enabled (SEmn = 1), rewriting by software is ignored, and the value of the CKOmn bit can be
changed only by a serial communication operation.
To use the pin for serial interface as a port function pin, set the corresponding CKOmn and SOmn bits to 1.
The SOm register can be set by a 16-bit memory manipulation instruction.
The values of each SOm register is 0303H following a reset.
Figure 12-14. Format of Serial Output Register m (SOm)
Address: F0128H, F0129H (SO0) After reset: 0303H R/W
Symbol 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SO0 0 0 0 0 0 0
0 0 0 0 0 0 SO01 SO00
CKOmn Serial clock output of channel n
0 Serial clock output value is 0.
1 Serial clock output value is 1.
SOmn Serial data output of channel n
0 Serial data output value is 0.
1 Serial data output value is 1.
Caution Be sure to clear bits 15 to 10, and 7 to 2 of the SO0 register to 0.
Remark m: Unit number (m = 0), n: Channel number (n = 0, 1)
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