RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 830
Dec 10, 2015
15.4.2 Stopping the operation by channels
The stopping of the operation by channels is set using each of the following registers.
Figure 15-24. Each Register Setting When Stopping the Operation by Channels (1/2)
(a) Serial channel stop register m (STm) … This register is a trigger register that is used to enable stopping
communication/count by each channel.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
STm
0
0
0
0
0
0
0
0
0
0
0
0
0
0
STm1
0/1
STm0
0/1
1: Clears the SEmn bit to 0 and stops the communication operation
* 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.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SEm
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SEm1
0/1
SEm0
0/1
0: Operation stops
* The SEmn 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
software.
(c) Serial output enable register m (SOEm) … This register is a register that is used to enable or stop output
of the serial communication operation of each channel.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SOEm
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SOEm1
0/1
SOEm0
0/1
0: Stops output by serial communication operation
* 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.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SOm
0
0
0
0
0
0
CKOm1
0/1
CKOm0
0/1
0
0
0
0
0
0
SOm1
0/1
SOm0
0/1
1: Serial clock output value is 1
1: Serial data 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, 1)
2. : Setting disabled (set to the initial value)
0/1: Set to 0 or 1 depending on the usage of the user
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