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參數(shù)資料
| 型號(hào)： | MCV14AI/P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDIP14 |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-14 |
| 文件頁(yè)數(shù)： | 28/84頁(yè) |
| 文件大小： | 1007K |
| 代理商： | MCV14AI/P |
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MCV14A
DS41338B-page 32
Preliminary
2009 Microchip Technology Inc.
6.2
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module or as a postscaler for the Watchdog
Timer (WDT), respectively (see Section 7.6 “Watch-
dog Timer (WDT)”). For simplicity, this counter is
being referred to as “prescaler” throughout this data
sheet.
The PSA and PS<2:0> bits (OPTION<3:0>) determine
prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (e.g., CLRF 1, MOVWF 1,
BSF 1
, x, etc.) will clear the prescaler. When assigned
to WDT, a CLRWDT instruction will clear the prescaler
along with the WDT. The prescaler is neither readable
nor writable. On a Reset, the prescaler contains all ‘0’s.
6.2.1
SWITCHING PRESCALER
ASSIGNMENT
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during
program execution). To avoid an unintended device
Reset, the following instruction sequence (Example 6-
1) must be executed when changing the prescaler
assignment from Timer0 to the WDT.
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
→ WDT)
To change the prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT
instruction
should
be
executed
before
switching the prescaler.
EXAMPLE 6-2:
CHANGING PRESCALER
(WDT
→ TIMER0)
Note:
The prescaler may be used by either the
Timer0 module or the WDT, but not both.
Thus, a prescaler assignment for the
Timer0 module means that there is no
prescaler for the WDT and vice versa.
CLRWDT
;Clear WDT
CLRF
TMR0
;Clear TMR0 & Prescaler
MOVLW
‘00xx1111’b ;These 3 lines (5, 6, 7)
OPTION
;are required only if
;desired
CLRWDT
;PS<2:0> are 000 or 001
MOVLW
‘00xx1xxx’b ;Set Postscaler to
OPTION
;desired WDT rate
CLRWDT
;Clear WDT and
;prescaler
MOVLW
‘xxxx0xxx’
;Select TMR0, new
;prescale value and
;clock source
OPTION
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MD8031AHB883B | 8-BIT, 12 MHz, MICROCONTROLLER, CDIP40 |
| MD8255A | 24 I/O, PIA-GENERAL PURPOSE, PDIP40 |
| MD82C52-/883 | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, CDIP28 |
| MR82C52-/883 | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, CQCC28 |
| MD82C55A-5/B | 24 I/O, PIA-GENERAL PURPOSE, CDIP40 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCV15/10-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 10WAY |
| MCV15/2-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 2WAY |
| MCV15/3-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 3WAY |
| MCV15/4-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 4WAY |
| MCV15/5-GF-381 | 制造商:Phoenix Contact 功能描述:HEADER PCB VERTICAL 3.81MM 5WAY |
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