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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 425
Jul 04, 2013
12.3.12 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”.
The SOm register can be set by a 16-bit memory manipulation instruction.
Reset signal generation clears the SO0 register to 0F0FH, and sets the SO1 register to 0303H.
Figure 12-15. Format of Serial Output Register m (SOm)
Address: F0128H, F0129H (SO0) After reset: 0F0FH R/W
Symbol 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SO0 0 0 0 0
CKO
03
CKO
02
CKO
01
CKO
00
0 0 0 0
SO
03
SO
02
SO
01
SO
00
Address: F0168H, F0169H (SO1)
Note
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”.
Note 32, 48, 64-pin products only
Caution Be sure to clear bits 15 to 12, 7 to 4 of the SO0 register, and bits 15 to 10, 7 to 2 of the SO1
register to “0”.
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3)
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