RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 348 of 920
Dec 22, 2016
14.3.13 Serial output level register m (SOLm)
The SOLm register is a register that is used to set inversion of the data output level of each channel.
This register can be set only in the UART mode. Be sure to set 0 for corresponding bit in the CSI mode.
Inverting channel n by using this register is reflected on pin output only when serial output is enabled (SOEmn =
1). When serial output is disabled (SOEmn = 0), the value of the SOmn bit is output as is.
Rewriting the SOLm register is prohibited when the register is in operation (when SEmn = 1).
The SOLm register can be set by a 16-bit memory manipulation instruction.
The lower 8 bits of the SOLm register can be set with an 8-bit memory manipulation instruction with SOLmL.
Reset signal generation clears the SOLm register to 0000H.
Figure 14 - 19 Format of Serial output level register m (SOLm)
Caution Be sure to clear bits 15 to 3, 1, and 0 of the SOL0 register, and bits 15 to 3, and 1 of the SOL1 register
to “0”.
Figure 14 - 20 shows examples in which the level of transmit data is reversed during UART transmission.
Address: F0134H, F0135H (SOL0) After reset: 0000H R/W
Symbol1514131211109876543210
SOL00000000000000
SOL
02
00
Address: F0174H, F0175H (SOL1) After reset: 0000H R/W
Symbol1514131211109876543210
SOL10000000000000
SOL
12
0
SOL
10
SOL
mn
Selects inversion of the level of the transmit data of channel n in UART mode
0 Communication data is output as is.
1 Communication data is inverted and output.
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