參數(shù)資料
型號(hào)： HE84G770B
廠商： King Billion Electronics Co., Ltd.
英文描述： 8-BIT MICRO-CONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 35/61頁(yè)
文件大?。?/td> 817K
代理商： HE84G770B
13.
Key Scan Circuit
King Billion Electronics Co., Ltd
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電
子
股
份
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公
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HE84G770
HE80004H SERIES
October 31, 2003
This specification is subject to change without notice. Please contact sales person for the latest version before use.
35
Version:V1.1
The built-in 4x20 hardware keyboard scan circuit helps to reduce the pin counts where application
requires large key matrix and high LCD pixel count as well as the firmware effort. As key-scan pins are
shared with LCD segment and PRTC4 ~ PRTC7 pins, it is advisable to put resistors between segment pins
and key matrix to avoid shorting the segment pins when two or more keys in the same row are pressed
simultaneously. Two key can be detected simultaneously and the first detected key code is stored in
KEY0 register and the second in KEY1 register respectively. The key code for each key location is listed
in the following table.
Key Loc
SCNO0
SCNO1
SCNO2
SCNO3
SCNO4
SCNO5
SCNO6
SCNO7
SCNO8
SCNO9
SCNO10
SCNO11
SCNO12
SCNO13
SCNO14
SCNO15
SCNO16
SCNO17
SCNO18
SCNO19
SCNI0 SCNI1
0x80
0x81
0x82
0x83
0x84
0x85
0x86
0x87
0x88
0x89
0x8A
0x8B
0x8C
0x8D
0x8E
0x8F
0x90
0x91
0x92
0x93
SCNI2
0xC0
0xC1
0xC2
0xC3
0xC4
0xC5
0xC6
0xC7
0xC8
0xC9
0xCA
0xCB
0xCC
0xCD
0xCE
0xCF
0xD0
0xD1
0xD2
0xD3
SCNI3
0xE0
0xE1
0xE2
0xE3
0xE4
0xE5
0xE6
0xE7
0xE8
0xE9
0xEA
0xEB
0xEC
0xED
0xEE
0xEF
0xF0
0xF1
0xF2
0xF3
0xA0
0xA1
0xA2
0xA3
0xA4
0xA5
0xA6
0xA7
0xA8
0xA9
0xAA
0xAB
0xAC
0xAD
0xAE
0xAF
0xB0
0xB1
0xB2
0xB3
KEY0
0x22
BIT7
R
BIT6
Row Index
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
Column Index
KEY1
0x23
BIT7
-
BIT6
Row Index
BIT5
BIT4
BIT3
BIT2
BIT1
BIT0
Column Index
The bit 7 of KEY0 and KEY1 is repeat indicator when the same key is scanned for the second time, the R
bit will be cleared to indicate the key is not released yet.
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