W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 125

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.2.3
This register controls pins used with handshaking peripherals such as modems and also controls the
diagnostic mode of the UART.
10.2.4
This register reflects the current state of four input pins used with handshake peripherals such as
modems and records changes on these pins.
DEFAULT
DEFAULT
NAME
BIT
NAME
7
6
5
4
3
2
1
0
BIT
BIT
Handshake Control Register (HCR) (Read/Write)
0
0
0
Internal Loopback Enable. When this bit is set to logic 1, the UART enters diagnostic
mode, as follows:
(1) SOUT is forced to logic 1, and SIN is isolated from the communication link.
(2) The modem output pins are set to their inactive state.
(3) The 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.
IRQ Enable. The UART interrupt output is enabled by setting this bit to logic 1. In
diagnostic mode, this bit is internally connected to the modem control input DCD#.
Loopback RI Input. This bit is only used in the diagnostic mode. In diagnostic mode, this
bit is internally connected to the modem control input RI#.
RTS (Request to Send). This bit controls the RTS# output. The value of this bit is
inverted and output to RTS#.
DTR (Data Terminal Ready). This bit controls the DTR# output. The value of this bit is
inverted and output to DTR#.
Handshake Status Register (HSR) (Read/Write)
DCD
NA
7
0
7
6
0
NA
RI
6
5
0
DSR
NA
5
LOOPBACK
INTERNAL
ENABLE
-114-
DESCRIPTION
4
0
CTS
NA
4
ENABLE
TDCD
IRQ
NA
3
0
3
LOOPBACK
RI INPUT
FERI
NA
2
2
0
W83627UHG
TDSR
NA
RTS
1
1
0
TCTS
DTR
NA
0
0
0