Rainbow Electronics W90P710CDG - Manual (Page 505)

W90P710CD/W90P710CDG
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COL[0]
COL[1]
COL[2]
COL[3]
A0
A1
A2
GS
16x8 keys
matrix
ROW[15:0] COL[7:0]
IN[7:0]
74148
ENCODER
74138
ROW[3:0]
W90P710
keypad I/F with 8:3 encoder
Fig. 6.21.1 Keypad Interface with row decoder and column encoder
Keypad Controller 3-keys Configuration Register (KPI3KCONF)
REGISTER ADDRESS R/W DESCRIPTION RESET VALUE
KPI3KCONF 0xFFF8_8004 W/R three-key configuration
register 0x0000_0000
31 30 29 28 27 26 25 24
RESERVED EN3KY ENRST
23 22 21 20 19 18 17 16
RESERVED K32R K32C
15 14 13 12 11 10 9 8
RESERVED K31R K31C
7 6 5 4 3 2 1 0
RESERVED K30R K30C