Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT

R01UH0330EJ0200 Rev.2.00 403

Dec 13, 2013

12.3.13 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 12-15. Format of Serial Output Level Register m (SOLm)

Address: F0134H, F0135H 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

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 12-16 shows examples in which the level of transmit data is reversed during UART transmission.

Figure 12-16. Examples of Reverse Transmit Data

(a) Non-reverse Output (SOLmn = 0)

SOLm = 0 output

SOUT0n

Transmit data

(b) Reverse Output (SOLmn = 1)

SOLm = 1 output

SOUT0n

Transmit data (inverted)

Remark m: Unit number (m = 0), n: Channel number (n = 0, 1)

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