參數(shù)資料
型號: PIC14000
廠商: Microchip Technology Inc.
英文描述: CTV 22C 22#22D SKT RECP
中文描述: 28引腳可編程混合信號控制器
文件頁數(shù): 18/152頁
文件大小: 953K
代理商: PIC14000
PIC14000
DS40122B-page 18
Preliminary
1996 Microchip Technology Inc.
4.2.2.2
OPTION REGISTER
The OPTION register (Address 81h) is a readable and
writable register which contains various control bits to
configure the TMR0/WDT prescaler, TMR0, and the
weak pull-ups on PORTC<5:0>. Bit 6 is reserved.
Note:
To achieve a 1:1 prescaler assignment,
assign the prescaler to the WDT (PSA=1)
FIGURE 4-4:
OPTION REGISTER
RCPU:
PORTC pull-up enable
1 = PORTC pull-ups are disabled overriding any port latch value (RC<5:0> only)
0 = PORTC pull-ups are enabled by individual port-latch values (RC<5:0>)
PSA PS2 PS1 PS0
R/W R/W R/W R/W R/W R/W R/W R/W
bit0
RCPU r T0CS T0SE
bit7
PS2
PS1
0
0
1
1
0
0
1
1
PS0
PSA:
Prescaler assignment bit
1 = Prescaler assigned to the WDT
0 = Prescaler assigned to TMR0
T0SE:
TMR0 source edge
1 = Increment on high-to-low transition on RC3/T0CKI pin
0 = Increment on low-to-high transition on RC3/T0CKI pin
T0CS:
TMR0 clock source
1 = Transition on RC3/T0CKI pin
0 = Internal instruction cycle clock (CLKOUT)
PRESCALER VALUE
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
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
Reserved.
This bit should be programmed as a ‘1’. Use of this bit as
general purpose read/write is not recommended since this may affect
upward compatibility with future products.
Address:
POR value:
81h
FFh
W:
R:
U:
Writable
Readable
Unimplemented.
Read as '0'
TMR0 RATE WDT RATE
PS2:PS0
Register: OPTION
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