參數(shù)資料
型號(hào): MB90F372PMT-G
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP144
封裝: 0.40 MM PITCH, PLASTIC, LQFP-144
文件頁數(shù): 148/153頁
文件大小: 2503K
代理商: MB90F372PMT-G
MB90370 Series
94
20. Bit decoder
The bit decoder is a simple one-hot decoder that can be used together with the keyscan inputs. It consists of a
bit data register (BDR), a decoder logic and a bit result register (BRR). A 4-bit encoded data can be loaded into
BDR, then the decoder logic will decode the data and store the 16-bit resulted data into BRR. Below shows the
decoder’s logic table.
(1) Register configuration of bit decoder
4-bit encoded data
16-bit resulted data
0H
1H
2H
3H
4H
5H
6H
7H
8H
9H
AH
BH
CH
DH
EH
FH
0000 0000 0000 0001B
0000 0000 0000 0010B
0000 0000 0000 0100B
0000 0000 0000 1000B
0000 0000 0001 0000B
0000 0000 0010 0000B
0000 0000 0100 0000B
0000 0000 1000 0000B
0000 0001 0000 0000B
0000 0010 0000 0000B
0000 0100 0000 0000B
0000 1000 0000 0000B
0001 0000 0000 0000B
0010 0000 0000 0000B
0100 0000 0000 0000B
1000 0000 0000 0000B
15
14
13
12
11
10
9
8
Bit Result Register (Upper)
BRRH
Bit number
R
X
R
X
R
X
R
X
R
X
R
X
R
X
Initial value
Read/write
R14
R13
R12
R11
R10
R9
R8
76
5
4
3
2
1
0
Bit Result Register (Lower)
BRRL
Bit number
Initial value
Read/write
R6
R5
R4
R3
R2
R1
R0
Address : 0000E2H
Address : 0000E3H
Bit Data Register
BDR
R/W
X
Initial value
Read/write
D0
-
Address : 0000E1H
R
X
R15
R7
-
R
X
R
X
R
X
R
X
R
X
R
X
R
X
R
X
15
14
13
12
11
10
9
8
Bit number
R/W
X
D1
R/W
X
D2
R/W
X
D3
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