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參數資料
型號: W83697F
廠商: WINBOND ELECTRONICS CORP
英文描述: WINBOND I/O
中文描述: 華邦的I / O
文件頁數: 59/167頁
文件大小: 1094K
代理商: W83697F
W83697HF/F
Publication Release Date: Feb. 2002
- 50 - Revision 0.70
4.2.3 Handshake Control Register (HCR) (Read/Write)
This register controls the pins of the UART used for handshaking peripherals such as modem, and
controls the diagnostic mode of the UART.
0
0
0
0
1
2
3
4
5
6
7
Data terminal ready (DTR)
Request to send (RTS)
Loopback RI input
IRQ enable
Internal loopback enable
Bit 4: When this bit is set to a logical 1, the UA RT enters diagnostic mode by an internal loopback, as
follows:
(1) SOUT is forced to logical 1, and SIN is isolated from the communication link instead of the
TSR.
(2) Modem output pins are set to their inactive state.
(3) Modem input pins are isolated from the communication link and connect internally as DTR
(bit 0 of HCR)
DSR, RTS ( bit 1 of HCR)
CTS, Loopback RI input ( bit 2 of HCR)
RI and IRQ enable ( bit 3 of HCR)
DCD.
Aside from the above connections, the UART operates normally. This method allows the CPU
to test the UART in a convenient way.
Bit 3: The UART interrupt output is enabled by setting this bit to a logic 1. In the diagnostic mode this bit
is internally connected to the modem control input DCD .
Bit 2: This bit is used only in the diagnostic mode. In the diagnostic mode this bit is internally
connected to the modem control input RI .
Bit 1: This bit controls the RTS output. The value of this bit is inverted and output to RTS.
Bit 0: This bit controls the DTR output. The value of this bit is inverted and output to DTR .
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