Renesas rl78 User Manual

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

9 8 7 6 5 4 3 2 1 0

SO0 0

CKO

0 0 0 0 SO

Address: F0168H, F0169H (SO1)

Note

After reset: 0303H R/W

Symbol 15

9 8 7 6 5 4 3 2 1 0

SO1

0 0 0 0 0 0

CKO

0 0 0 0 0 0 SO

CKO

Serial clock output of channel n

Serial clock output value is “0”.

Serial clock output value is “1”.

Serial data output of channel n

Serial data output value is “0”.

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)

<R>