W78C354 Datasheet, PDF (14/44 Pages) Winbond – MONITOR MICROCONTROLLER

W78C354
5. CONTREG5: Control Register5
BIT
NAME
FUNCTION
0
-
Reserved.
1
-
Reserved.
2
-
Reserved.
3
-
Reserved.
4
-
Reserved.
5
HDSEL HCLAMP Source SELect.
6
DPARAINT Enable parabola interrupt with dummy signal.
DPARAINT = 0; V dummy signal will generate VEVENT interrupt.
DPARAINT = 1; V dummy signal will not generate VEVENT interrupt.
7
-
Reserved.
E. I/O Port
The I/O ports available in the W78C354 vary with the package, as shown in the table below:
I/O PORT
68-PIN PLCC
48-PIN DIP
40-PIN DIP
Port 1
6 bits
6 bits
6 bits
Port 2
8 bits
8 bits
8 bits
Port 3
8 bits
7 bits
3 bits
Port 4
7 bits
N.A.
N.A.
P1, P2, and P3 are the SFR latches of ports 1, 2, and 3, respectively. Writing a "1" to a bit of a port
SFR (P1, P2, or P3) causes the corresponding port output pin to switch to high. Writing a "0" causes
the port output pin to switch to low. When a port is used as an input, the external state of the port pin
will be read into the port SFR (i.e., if the external state is low, the corresponding SFR bit will contain a
"0"; if it is high, the bit will contain a "1"). The block diagrams and control registers are shown below.
E-1 Port 1
Besides general purpose I/O functions, port 1 provides the functions shown in the following table.
PINS
P1.0
P1.1
SPECIAL FUNCTION
ISCL
ISDA
SPECIAL FUNCTION
CONTROL BIT
-
-
DESCRIPTION
s/w I²C SCL pin
s/w I²C SDA pin
P1.2
DSCL
-
DDC port's SCL pin
P1.3
DSDA
-
DDC port's SDA pin
P1.4
HCLAMP
P14SF
H-clamp pulse output
P1.5
SOA
P15SF
SOA output
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