Renesas RL78 Series User Manual page 413

16-bit single-chip microcontrollers

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13.3.12 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 SOm register to 0F0FH.

Address: F0128H, F0129H (SO0)

Address: F0168H, F0169H (SO1)

Serial clock output value is "0".

Serial clock output value is "1".

Serial data output value is "0".

Serial data output value is "1".

Caution Be sure to clear bits 15 to 11, 9, and 7 to 3, 1 of the SO0 register to "0".

Be sure to clear bits 15 to 10 and 7 to 2 of the SO1 register to "0".

Remark m: Unit number (m = 0, 1), n: Channel number (n = 0, 2 for m = 0, n = 0, 1 for m = 1)

R01UH0515EJ0120 Rev.1.20

Dec 16, 2016

Figure 13-16. Format of Serial Output Register m (SOm)

After reset: 0F0FH

After reset: 0F0FH

CHAPTER 13 SERIAL ARRAY UNIT

Serial clock output of channel n

Serial data output of channel n

Rl78/g1d R5f11agg R5f11agh R5f11agj