Renesas RL78 Series User Manual page 419

16-bit single-chip microcontrollers

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13.4.2 Stopping the operation by channels

The stopping of the operation by channels is set using each of the following registers.

Figure 13-23. Each Register Setting When Stopping the Operation by Channels

(a) Serial channel stop register m (STm) ... This register is a trigger register that is used to enable

stopping communication/count by each channel.

Because the STmn bit is a trigger bit, it is cleared immediately when SEmn = 0.

(b) Serial Channel Enable Status Register m (SEm) ... This register indicates whether data

transmission/reception operation of each channel is enabled or stopped.

The SEm register is a read-only status register, whose operation is stopped by using the STm register.

With a channel whose operation is stopped, the value of the CKOmn bit of the SOm register can be set by

output of the serial communication operation of each channel.

For channel n, whose serial output is stopped, the SOmn bit value of the SOm register can be set by software.

(d) Serial output register m (SOm) ...This register is a buffer register for serial output of each channel.

1: Serial clock output value is "1"

* When using pins corresponding to each channel as port function pins, set the corresponding CKOmn, SOmn bits to "1".

Remarks 1. m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3 for m = 0, n = 0, 1 for m = 1)

: Setting disabled (fixed by hardware), 0/1: Set to 0 or 1 depending on the usage of the user

R01UH0515EJ0120 Rev.1.20

Dec 16, 2016

1: Clears the SEmn bit to 0 and stops the communication operation

0: Stops output by serial communication operation

0: Operation stops

1: Serial data output value is "1"

CHAPTER 13 SERIAL ARRAY UNIT

Rl78/g1d R5f11agg R5f11agh R5f11agj