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參數(shù)資料
| 型號： | MCV14ATI/SL |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO14 |
| 封裝： | 3.90 MM, PLASTIC, SOIC-4 |
| 文件頁數(shù)： | 9/84頁 |
| 文件大?。?/td> | 1007K |
| 代理商： | MCV14ATI/SL |
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2009 Microchip Technology Inc.
Preliminary
DS41338B-page 15
MCV14A
3.4
OPTION Register
The OPTION register is a 8-bit wide, write-only register,
which contains various control bits to configure the
Timer0/WDT prescaler and Timer0.
By executing the OPTION instruction, the contents of
the W register will be transferred to the OPTION
register. A Reset sets the OPTION<7:0> bits.
Note:
If TRIS bit is set to ‘0’, the wake-up on
change and pull-up functions are disabled
for that pin (i.e., note that TRIS overrides
Option control of RBPU and RBWU).
REGISTER 3-2:
OPTION: OPTION REGISTER
W-1
RBWU
RBPU
T0CS(1)
T0SE
PSA
PS2
PS1
PS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
RBWU: Enable Wake-up On Pin Change bit
1
= Disabled
0
= Enabled
bit 6
RBPU: Enable Weak Pull-ups bit
1
= Disabled
0
= Enabled
bit 5
T0CS: Timer0 Clock Source Select bit(1)
1
= Transition on T0CKI pin
0
= Internal instruction cycle clock (CLKOUT)
bit 4
T0SE: Timer0 Source Edge Select bit
1
= Increment on high-to-low transition on T0CKI pin
0
= Increment on low-to-high transition on T0CKI pin
bit 3
PSA: Prescaler Assignment bit
1
= Prescaler assigned to the WDT
0
= Prescaler assigned to Timer0
bit 2-0
PS<2:0>: Prescaler Rate Select bits
Note 1:
If the T0CS bit is set to ‘1’, it will override the TRIS function on the T0CKI pin.
000
001
010
011
100
101
110
111
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
Bit Value
Timer0 Rate
WDT Rate
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