GMS30C7201 Datasheet, PDF (255/352 Pages) Hynix Semiconductor – 60MHz operation frequency Low power consumption

Slow AMBA Peripherals
Keyboard value register (KBVR0–KBVR2)
This is a 32-bit readable register that has a value of scanin. For example, if the value of
KBVR0[32:24] is 00001100, the 5th and 6th keys are pressed and the others are released. In TIC
mode, the TICIN value is inverted, compared and stored to the keyboard value register.
Bit
31:24
23:16
15:8
7:0
Name
KBVR0
KBVR0
KBVR0
KBVR0
Initial value
0
0
0
0
Description
10st column scanin value
9nd column scanin value
8rd column scanin value
7th column scanin value
31:24 KBVR1
0
23:16 KBVR1
0
15:8 KBVR1
0
7:0
KBVR1
0
6th column scanin value
5th column scanin value
4th column scanin value
3th column scanin value
31:24
23:16
15:8
7:0
KBVR2
KBVR2
KBVR2
KBVR2
0
2th column scanin value
0
1th column scanin value
0
0zth column scanin value
0
Reserved
Table 13-18: KBVR0–KBVR2 bit description
TIC out register (TICOUT)
This is a test register that allows the KBD output signal to the keypad to be read back in test
mode. No more than two bits can be reset, causing the interface to scan only one line during
each scan period, except when the keyboard is disabled (ScanEn bit of KBCR=0).
Bit
Initial value
Description
10
0
0 = 1st line will be scanned
1 = no scan
9
0
0 = 2nd line will be scanned
1 = no scan
8
0
0 = 3rd line will be scanned
1 = no scan
7
0
0 = 4th line will be scanned
1 = no scan
6
0
0 = 5th line will be scanned
1 = no scan
Table 13-19: TIC out register
GMS30C7201 Data Sheet
13-27