W83627EHG Nuvoton Technology Corporation of America, W83627EHG Datasheet - Page 188

• Manufacturer Part Number: W83627EHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EHG

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

The input buffer is an 8-bit, write-only register at I/O address 60h or 64h (Default, PnP programmable
I/O address LD5-CR60, LD5-CR61, LD5-CR62, and LD5-CR63). Writing to address 60h sets a flag to
indicate a data write; writing to address 64h sets a flag to indicate a command write. Data written to I/O
address 60h is sent to the keyboard (unless the keyboard controller is expecting a data byte) through
the controller's input buffer only if the input buffer full bit (in the status register) is logical 0.
11.3 Status Register
The status register is an 8-bit, read-only register at I/O address 64h (Default, PnP programmable I/O
address LD5-CR62 and LD5-CR63) that holds information about the status of the keyboard controller
and interface. It may be read at any time.
11.4 Commands
BIT
0
1
2
3
4
5
6
7
Output Buffer Full
Input Buffer Full
System Flag
Command/Data
Inhibit Switch
Auxiliary Device Output Buffer
General Purpose Time-out
Parity Error
BIT FUNCTION
0: Output buffer empty
1: Output buffer full
0: Input buffer empty
1: Input buffer full
This bit may be set to 0 or 1 by writing to the
system flag bit in the command byte of the
keyboard controller. It defaults to 0 after a
power-on reset.
0: Data byte
1: Command byte
0: Keyboard is inhibited
1: Keyboard is not inhibited
0: Auxiliary device output buffer empty
1: Auxiliary device output buffer full
0: No time-out error
1: Time-out error
0: Odd parity
1: Even parity (error)
W83627EHF/EF, W83627EHG/EG
-177-
DESCRIPTION
Publication Release Date: April 7, 2009
Version 1.94