Serial Output Register M (Som) - Renesas RL78/G1P Hardware User Manual

RL78/G1P

11.3.12 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 a pin for the serial interface as a port function pin other than a serial interface function pin, set the
corresponding the CKOmn and SOmn bits to 1.
The SOm register can be set by a 16-bit memory manipulation instruction.
Reset signal generation clears the SOm register to 0303H.
Address: F0128H, F0129H (SO0)
Symbol 15 14
SO0 0 0
CKO
mn
0 Serial clock output value is "0".
1 Serial clock output value is "1".
SO
mn
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"
Be sure to set bits 9 and 1 of the SO0 register to "1".
Remark m: Unit number (m = 0), n: Channel number (n = 0)
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
Figure 11-14. Format of Serial Output Register m (SOm)
After reset: 0303H R/W
13 12 11 10
0 0 0 0
CHAPTER 11 SERIAL ARRAY UNIT
9 8 7 6
1 CKO 0 0
00
Serial clock output of channel n
Serial data output of channel n
5 4 3 2
0 0 0 0
1 0
1 SO
00
330