RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 389 of 765
Mar 7, 2023
12.3.13 Serial output level register m (SOLm)
The SOLm register 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 the bit corresponding the channel used in the
simplified SPI (CSI) mode or simplified I
2
C 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.
The value of each SOLm register is 0000H following a reset.
Figure 12-15. Format of Serial Output Level Register m (SOLm)
Address: F0134H, F0135H (SOL0) After reset: 0000H R/W
Symbol 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SOL0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 SOL00
SOLmn 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.
Caution Be sure to clear bits 15 to 1 of the SOL0 register to 0.
Figure 12-16 shows examples in which the level of transmit data is reversed during UART transmission.
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