GMS30C7201 Datasheet, PDF (254/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Slow AMBA Peripherals
13.4.6 Keyboard interface controller unit register descriptions
The following registers are provided for the keyboard interface controller unit.
Keyboard configuration register (KBCR)
This is an 8-bit writable and readable register that selects scan clock mode and scan enable, and
test mode, etc. The Scan bit and Power down bit are usually set or reset simultaneously. During
a test, the Scan bit and Power down bit could have differing values.
Bit
Name
Initial value
Description
7
Scan En
0
Start and stop scanning
0 = stop
1 = start
6
TIC EN
0
TIC mode
0 = disable (normal
mode)
1 = enable (test mode)
5
TIC Clock EN 0
Select input clk
0 = PCLK (normal
mode)
1 = TCLK (test mode)
4
Scan Clock
0
select
Select Scan Clk for fast
test
0 = normal scan clk
1 = test mode
scan clk = 1.84MHz
3
Reserved
0
Reserved
2
Power down 0
Power down
0 = power down mode,
where clock is not
operating
1 = normal mode, where
clock is operating
1:0
Clksel
0
Scanning rate control
00 = 1.84MHz
01 = 28kHz
10 = 14kHz
11 = 7kHz
Table 13-17: KBCR bit description
13-26
GMS30C7201 Data Sheet