w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 113

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

10.1 Basic I/O functions
The Basic I/O functions of W83977ATF/ATG provide several I/O operations, including driving a logic
value to output port, latching a logic value from input port, inverting the input/output logic value, and
steering Common Interrupt (only available in the second group of the GP I/O port). Common Interrupt
is the ORed function of all interrupt channels in the second group of the GP I/O ports, and it also
connects to a 1ms debounce filter which can reject a noise of 1 ms pulse width or less. There are
three 8-bit registers (GP1, GP2, and GP3) which are directly connected to those GP I/O ports. Each
GP I/O port is represented as a bit in one of three 8-bit registers. Only 6 bits of GP2 are implemented.
Table 10.1.1 shows their combinations of Basic I/O functions, and Table 10.1.2 shows the register bit
assignments of GP1, GP2, and GP3.
Table 10.1.1
0 = OUTPUT
1 = INPUT
I/O BIT
0
0
0
0
1
1
1
1
ENABLE INT BIT
0 = DISABLE
1 = ENABLE
0
0
1
1
0
0
1
1
0 = NON INVERT
POLARITY BIT
1 = INVERT
0
1
0
1
0
1
0
1
- 105 -
W83977ATF/W83977ATG
Basic non-inverting output
Basic inverting output
Non-inverted output bit value of GP2 drive
to Common Interrupt
Inverted output bit value of GP2 drive to
Common Interrupt
Basic non-inverting input
Basic inverting input
Non-inverted input drive to Common
Interrupt
Inverted input drive to Common Interrupt
Publication Release Date: May 2006
BASIC I/O OPERATIONS
Revision 0.6