RL78/G1P
CHAPTER 11 SERIAL ARRAY UNIT
R01UH0895EJ0100 Rev.1.00
331
Nov 29, 2019
11.3.13 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 11-15. 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
SOL
00
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.
Caution Be sure to clear bits 15 to 1 to “0”.
Remark
m: Unit number (m = 0), n: Channel number (n = 0)
Figure 11-16 shows examples in which the level of transmit data is reversed during UART transmission.
Figure 11-16. Examples of Reverse Transmit Data
(a) Non-reverse Output (SOLmn = 0)
Transmit data
ST
P
S
SOLm = 0 output
SOUT0n
(b) Reverse Output (SOLmn = 1)
Transmit data (inverted)
ST
P
S
SOLm = 1 output
SOUT0n
Remark
m: Unit number (m = 0), n: Channel number (n = 0, 2)