參數(shù)資料
型號(hào): PIC16F57-I/P
廠商: Microchip Technology
文件頁(yè)數(shù): 32/88頁(yè)
文件大?。?/td> 0K
描述: IC MCU FLASH 2KX12 28DIP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 15
系列: PIC® 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 20MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 20
程序存儲(chǔ)器容量: 3KB(2K x 12)
程序存儲(chǔ)器類(lèi)型: 閃存
RAM 容量: 72 x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.600",15.24mm)
包裝: 管件
產(chǎn)品目錄頁(yè)面: 638 (CN2011-ZH PDF)
配用: XLT28XP-ND - SOCKET TRANSITION ICE 28DIP
AC164001-ND - MODULE SKT PROMATEII 18/28DIP
PIC16F5X
DS41213D-page 36
2007 Microchip Technology Inc.
7.2.1
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 7-1) must be
executed when changing the prescaler assignment
from Timer0 to the WDT.
EXAMPLE 7-1:
CHANGING PRESCALER
(TIMER0
→WDT)
To change prescaler from the WDT to the Timer0
module, use the sequence shown in Example 7-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT
instruction
should
be
executed
before
switching the prescaler.
EXAMPLE 7-2:
CHANGING PRESCALER
(WDT
→TIMER0)
FIGURE 7-5:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
CLRWDT
;Clear WDT
CLRF
TMR0
;Clear TMR0 &
;Prescaler
MOVLW
B'00xx1111’
;Last 3 instructions
;in this example
OPTION
;are required only if
;desired
CLRWDT
;PS<2:0> are 000 or 001
MOVLW
B'00xx1xxx’
;Set Prescaler to
OPTION
;desired WDT rate
CLRWDT
;Clear WDT and
;prescaler
MOVLW
B'xxxx0xxx'
;Select TMR0, new
;prescale value and
;clock source
OPTION
T0CKI
T0SE(1)
pin
TCY ( = FOSC/4)
Sync
2
Cycles
TMR0 reg
8-bit Prescaler
8-to-1 MUX
M
MUX
Watchdog
Timer
PSA(1)
0
1
0
1
WDT
Time-Out
PS<2:0>(1)
8
PSA(1)
WDT Enable bit
0
1
0
1
Data Bus
8
PSA(1)
T0CS(1)
M
U
X
M
U
X
U
X
Note
1:
T0CS, T0SE, PSA PS<2:0> are bits in the Option register.
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