Rainbow Electronics W90P710CDG - Manual (Page 509)

W90P710CD/W90P710CDG
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BITS DESCRIPTION
[17] 2KEY
Double-key press
This bit indicates that 2 keys have been detected. Software can read
{KEY1R, KEY1C} and {KEY0R, KEY0C} to know which two keys are
pressed.
[16] 1KEY
Single-key press
This bit indicates that 1 key has been detected. Software can read
{KEY0R, KEY0C} to know which key is pressed.
[15] RESERVED -
[14:11] KEY1R
KEY1 row address
This value indicates key1 row address. The keypad controller scan
keypad matrix from row 0, column0 Ж1 Ж2 …. Ж 7 and then row1
column 0 Ж 1 Ж 2 Ж7 so the lowest key address will be stored in
{KEY0R, KEY0C}. This register stores the 2
nd address, if more than one
key is pressed.
[10:8] KEY1C
KEY1 column address
This value indicates key1 column address..
[7] RESERVED -
[6:3] KEY0R
KEY1 row address
This value indicates key0 row address. This value indicates key0 row
address. This value indicates key1 row address. The keypad controller
scan keypad matrix from row 0, column0 Ж1 Ж2 …. Ж 7 and then
row1 col 0 Ж 1 Ж 2 Ж …Ж 7 still to row16 (or 8, or 4) column 0 Ж 1 Ж
2 ….. Ж 7 so the lowest key address will be stored in {KEY0R,
KEY0C}.
[2:0] KEY0C
KEY1 column address
This value indicates key0 row address.