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型號(hào)：	UPD780076
廠商：	NEC Corp.
元件分類：	8位微控制器
英文描述：	8-Bit Single-Chip Microcontrollers
中文描述：	8位單芯片微控制器
文件頁(yè)數(shù)：	272/592頁(yè)
文件大?。?/td>	3307K
代理商：	UPD780076

CHAPTER 15 SERIAL INTERFACE UART2

s Manual U14260EJ3V1UD

15.3 Registers to Control Serial Interface UART2

Serial interface UART2 uses the following eight registers for control functions.

Asynchronous serial interface mode register 2 (ASIM2)

Asynchronous serial interface status register 2 (ASIS2)

Asynchronous serial interface transmit status register 2 (ASIF2)

Baud rate generator control register 2 (BRGC2)

Clock select register 2 (CKSEL2)

Transfer mode specification register 2 (TRMC2)

Port mode register 3 (PM3)

Port register 3 (P3)

(1) Asynchronous serial interface mode register 2 (ASIM2)

This is an 8-bit register that controls serial interface UART2

s serial transfer operations.

ASIM2 is set by a 1-bit or 8-bit memory manipulation instruction.

RESET input clears ASIM2 to 00H.

Figure 15-3. Format of Asynchronous Serial Interface Mode Register 2 (ASIM2) (1/2)

Address: FF90H After reset: 00H R/W

Clock operation enable/stop

Stop clock operation. Power consumption decreases and latch in UART2 is

asynchronously reset (T

D2 pin is low).

Enable clock operation (T

D2 pin is high).

Transmission enable/stop

Stop transmission (transmission circuit is synchronously reset).

Enable transmission.

Reception enable/stop

Stop reception (reception circuit is synchronously reset).

Enable reception.

In the infrared data transfer (IrDA) mode, the TxD2 pin is at the low level.

To transmit data with UART2, first specify the clock operation (set POWER2 to 1 and then TXE2 to

1), wait for the duration of 2 clocks

, and then write the transmit data to transmit buffer register

2 (TXB2). To stop transmission by UART2, specify stopping transmission (TXE2 = 0), wait for the

duration of 2 clocks

, and then stop the clock operation (POWER2 = 0).

To receive data with UART2, first specify the clock operation (set POWER2 to 1 and then RXE2 to

1), wait for the duration of 2 clocks

, and then start reception. To stop reception by UART2, specify

stopping reception (RXE2 = 0), wait for the duration of 2 clocks

, and then stop the clock operation

(POWER2 = 0).

The clock is the output clock of the 8-bit counter or the output clock of the baud rate generator.

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