參數(shù)資料
型號： PIC16F628A
廠商： Microchip Technology Inc.
英文描述： 18-pin Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology(18引腳，基于FLASH的8位CMOS微控制器，使用毫微瓦特技術(shù))
中文描述： 18引腳基于閃存的8位CMOS微控制器與納瓦技術(shù)（18引腳，基于閃存的8位的CMOS微控制器，使用毫微瓦特技術(shù)）
文件頁數(shù)： 108/168頁
文件大?。?/td> 2756K
代理商： PIC16F628A
PIC16F627A/628A/648A
DS40044B-page 106
Preliminary
2004 Microchip Technology Inc.
TABLE 14-8:
SUMMARY OF INTERRUPT REGISTERS
14.6
Context Saving During Interrupts
During an interrupt, only the return PC value is saved
on the stack. Typically, users may wish to save key
registers during an interrupt (e.g., W register and
Status Register). This must be implemented in
software.
Example 14-2 stores and restores the Status and W
registers. The user register, W_TEMP, must be defined
in a common memory location (i.e., W_TEMP is
defined at 0x70 in Bank 0 and is therefore, accessible
at 0xF0, 0x170 and 0x1F0). The Example 14-2:
Stores the W register
Stores the Status Register
Executes the ISR code
Restores the Status (and bank select bit register)
Restores the W register
EXAMPLE 14-2:
SAVING THE STATUS
AND W REGISTERS IN
RAM
14.7
Watchdog Timer (WDT)
The watchdog timer is a free running on-chip RC
oscillator which does not require any external
components. This RC oscillator is separate from the
RC oscillator of the CLKIN pin. That means that the
WDT will run, even if the clock on the OSC1 and OSC2
pins of the device has been stopped, for example, by
execution of a
SLEEP
instruction. During normal oper-
ation, a WDT time out generates a device Reset. If the
device is in Sleep mode, a WDT time out causes the
device to wake-up and continue with normal operation.
The WDT can be permanently disabled by program-
ming
the
configuration
(
Section 14.1 "Configuration Bits"
).
bit
WDTE
as
clear
14.7.1
WDT PERIOD
The WDT has a nominal time out period of 18 ms (with
no prescaler). The time out periods vary with tempera-
ture, V
DD
and process variations from part to part (see
DC Specifications, Table 17-7). If longer time out
periods are desired, a postscaler with a division ratio of
up to 1:128 can be assigned to the WDT under
software control by writing to the OPTION register.
Thus, time out periods up to 2.3 seconds can be
realized.
The
CLRWDT
and
SLEEP
instructions clear the WDT
and the postscaler, if assigned to the WDT, and prevent
it from timing out and generating a device Reset.
The TO bit in the Status Register will be cleared upon a
Watchdog Timer time out.
14.7.2
WDT PROGRAMMING
CONSIDERATIONS
It should also be taken in account that under worst case
conditions (V
DD
= Min., Temperature = Max., max.
WDT prescaler) it may take several seconds before a
WDT time out occurs.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR Reset
Value on all
other
Resets
(1)
0Bh, 8Bh,
10Bh, 18Bh
0Ch
8Ch
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 000u
PIR1
PIE1
EEIF
EEIE
CMIF
CMIE
RCIF
RCIE
TXIF
TXIE
—
—
CCP1IF
CCP1IE TMR2IE TMR1IE
TMR2IF
TMR1IF
0000 -000
0000 -000
0000 -000
0000 -000
Note
1:
Other (non Power-up) Resets include MCLR Reset, Brown-out Reset and Watchdog Timer Reset during normal
operation.
MOVWF W_TEMP
;copy W to temp register,
;could be in any bank
;swap status to be saved
;into W
;change to bank 0
;regardless of current
;bank
SWAPF STATUS,W
BCF
STATUS,RP0
MOVWF STATUS_TEMP ;save status to bank 0
;register
:
:(ISR)
:
SWAPF STATUS_TEMP,W;swap STATUS_TEMP register
;into W, sets bank to original
;state
MOVWF STATUS
;move W into STATUS register
SWAPF W_TEMP,F
;swap W_TEMP
SWAPF W_TEMP,W
;swap W_TEMP into W
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16F628A-E/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F628A-E/P 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F628A-E/SO 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F628A-E/SS 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F628A-I/ML 功能描述:8位微控制器 -MCU 3.5KB 224 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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