W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 6

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

1.1 Host Interface, continued
1.2 Serial Port Interface
GIO1
GIO0
IRQ_C
IRQ_D
IRQ_E
IRQ_F
XTAL1
XTAL2
CTSA
CTSB
DSRA
DSRB
DCDA
DCDB
RIA
RIB
SINA
SINB/IRRX1
SOUTA/
PIRIDE
IRQ_ A /
IRQ_ B /
SYMBOL
SYMBOL
PIN
PIN
96
92
44
37
23
99
34
47
33
48
32
49
31
50
30
42
38
7
8
OUT
OUT
OUT
OUT
OUT
OUT
OUT
I/O
I/O
I/O
I/O
IN
I/O
IN
IN
IN
IN
IN
12t
12t
c
t
t
t
t
t
8t
12t
12t
12t
12t
12t
12t
8t
When CR16 Bit 4 (GOIQSEL) = 0: Interrupt request signal A;
When CR16 Bit 4 (GOIQSEL) = 1: General Purpose I/O port 1.
When CR16 Bit 4 (GOIQSEL) = 0: Interrupt request signal B;
When CR16 Bit 4 (GOIQSEL) = 1: General Purpose I/O port 0.
Interrupt request signal C
Interrupt request signal D
Interrupt request signal E
Interrupt request signal F
XTAL oscillator input
XTAL oscillator output
Clear To Send is the modem control input.
The function of these pins can be tested by reading Bit 4 of the
handshake status register.
Data Set Ready. An active low indicates the modem or data set
is ready to establish a communication link and transfer data to
the UART.
Data Carrier Detect. An active low indicates the modem or data
set has detected a data carrier.
Ring Indicator. An active low indicates that a ring signal is being
received by the modem or data set.
Serial Input. Used to receive serial data from the communication
link.
UART A Serial Output. Used to transmit serial data out to the
communication link.
During power-on reset, this pin is pulled up internally and is
defined as PIRIDE, which provides the power-on value for CR16
bit 1 (IRIDE). A 47 k
down at power-on reset.
- 6 -
is recommended when intends to pull
FUNCTION
FUNCTION
W83877F