RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 819
Dec 10, 2015
15.3.12 Serial output register m (SOm)
The SOm register 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.
Set the SOm register by a 16-bit memory manipulation instruction.
Reset signal generation clears the SOm register to 0303H.
Figure 15-15. Format of Serial Output Register m (SOm)
Address: F0118H, F0119H 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
CKO
01
CKO
00
0 0 0 0 0 0
SO
01
SO
00
Address: F0158H, F0159H After reset: 0303H R/W
Symbol 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SO1 0 0 0 0 0 0
CKO
11
CKO
10
0 0 0 0 0 0
SO
11
SO
10
CKO
mn
Serial clock output of channel n
0 Serial clock output value is 0.
1 Serial clock output value is 1.
SO
mn
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 12 and 7 to 2 of the SOm register to 0.
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0, 1)
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