GMS30C7201 Datasheet, PDF (251/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Slow AMBA Peripherals
13.4 Keyboard Interface
The Keyboard Interface Controller is an AMBA slave module which connects to the Advanced
Peripheral Bus (APB). For more information about AMBA, please refer to the AMBA
Specification (ARM IHI 0001).
13.4.1 Overview
The keyboard interface controller unit has:
• four scanning modes
• 8x11 Matrix
• 11 byte key buffers
• TIC mode
APB
psel
pa
PCLK
control signal generating unit
scanclk generating unit
scanout generating unit
TICOUT
scanout
11
pd
pstb
pwrite
INTKBD
.
.
11 x 8bit
register file
.
.
previous key value
KBCR
INTFLAG
compare
TICIN
scanin
8
8 x 11
Matrix
Figure 13-2: Keyboard interface block diagram
GMS30C7201 Data Sheet
13-23