參數(shù)資料
型號: PIC16F84AT-20E/SO
廠商: Microchip Technology
文件頁數(shù): 15/81頁
文件大小: 0K
描述: IC MCU CMOS 20MHZ 1K FLSH 18SOIC
標(biāo)準(zhǔn)包裝: 1,100
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): 13
程序存儲器容量: 1.75KB(1K x 14)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 64 x 8
RAM 容量: 68 x 8
電壓 - 電源 (Vcc/Vdd): 4 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 18-SOIC(0.295",7.50mm 寬)
包裝: 帶卷 (TR)
PIC16F84A
DS35007B-page 20
2001 Microchip Technology Inc.
5.2.1
SWITCHING PRESCALER
ASSIGNMENT
The prescaler assignment is fully under software con-
trol (i.e., it can be changed “on the fly” during program
execution).
5.3
Timer0 Interrupt
The TMR0 interrupt is generated when the TMR0 reg-
ister overflows from FFh to 00h. This overflow sets bit
T0IF (INTCON<2>). The interrupt can be masked by
clearing bit T0IE (INTCON<5>). Bit T0IF must be
cleared in software by the Timer0 module Interrupt Ser-
vice Routine before re-enabling this interrupt. The
TMR0 interrupt cannot awaken the processor from
SLEEP since the timer is shut-off during SLEEP.
FIGURE 5-2:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
TABLE 5-1:
REGISTERS ASSOCIATED WITH TIMER0
Note:
To avoid an unintended device RESET, a
specific instruction sequence (shown in the
PICmicro Mid-Range Reference Man-
ual, DS33023) must be executed when
changing the prescaler assignment from
Timer0 to the WDT. This sequence must
be followed even if the WDT is disabled.
RA4/T0CKI
T0SE
pin
M
U
X
CLKOUT (= FOSC/4)
SYNC
2
Cycles
TMR0 reg
8-bit Prescaler
8 - to - 1 MUX
M
U
X
M U X
Watchdog
Timer
PSA
0
1
0
1
WDT
Time-out
PS2:PS0
8
Note: T0CS, T0SE, PSA, PS2:PS0 are (OPTION_REG<5:0>).
PSA
WDT Enable bit
M
U
X
0
1
0
1
Data Bus
Set Flag bit T0IF
on Overflow
8
PSA
T0CS
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR,
BOR
Value on all
other
RESETS
01h
TMR0
Timer0 Module Register
xxxx xxxx
uuuu uuuu
0Bh,8Bh
INTCON
GIE
EEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 000u
81h
OPTION_REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
1111 1111
85h
TRISA
PORTA Data Direction Register
---1 1111
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by Timer0.
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