參數(shù)資料
型號: PIC18F442T-E/ML
廠商: Microchip Technology
文件頁數(shù): 19/134頁
文件大?。?/td> 0K
描述: IC MCU FLASH 8KX16 EE A/D 44QFN
標(biāo)準(zhǔn)包裝: 1,600
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 40MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,LVD,POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 16KB(8K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 768 x 8
電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 44-VQFN 裸露焊盤
包裝: 帶卷 (TR)
1997 Microchip Technology Inc.
DS30444E - page 115
PIC16C9XX
14.5.1
INT INTERRUPT
External interrupt on RB0/INT pin is edge triggered:
either rising if bit INTEDG (OPTION<6>) is set, or fall-
ing, if the INTEDG bit is clear. When a valid edge
appears
on
the
RB0/INT
pin,
ag
bit
INTF
(INTCON<1>) is set. This interrupt can be disabled by
clearing enable bit INTE (INTCON<4>). Flag bit INTF
must be cleared in software in the interrupt service rou-
tine before re-enabling this interrupt. The INT interrupt
can wake-up the processor from SLEEP, if bit INTE was
set prior to going into SLEEP. The status of global inter-
rupt enable bit GIE decides whether or not the proces-
sor branches to the interrupt vector following wake-up.
See Section 14.8 for details on SLEEP mode.
14.5.2
TMR0 INTERRUPT
An overow (FFh
→ 00h) in the TMR0 register will set
ag bit T0IF (INTCON<2>). The interrupt can be
enabled/disabled by setting/clearing enable bit T0IE
(INTCON<5>). (Section 7.0)
14.5.3
PORTB INTCON CHANGE
An input change on PORTB<7:4> sets ag bit RBIF
(INTCON<0>). The interrupt can be enabled/disabled
by setting/clearing enable bit RBIE (INTCON<4>).
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 reg-
isters during an interrupt i.e., W register and STATUS
register. This will have to be implemented in software.
Example 14-1 stores and restores the STATUS, W, and
PCLATH registers. The register, W_TEMP, must be
dened in each bank and must be dened at the same
offset from the bank base address (i.e., if W_TEMP is
dened at 0x20 in bank 0, it must also be dened at
0xA0 in bank 1).
The example:
a)
Stores the W register.
b)
Stores the STATUS register in bank 0.
c)
Stores the PCLATH register.
d)
Executes the ISR code.
e)
Restores the STATUS register (and bank select
bit).
f)
Restores the W and PCLATH registers.
EXAMPLE 14-1: SAVING STATUS, W, AND PCLATH REGISTERS IN RAM
MOVWF
W_TEMP
;Copy W to TEMP register, could be bank one or zero
SWAPF
STATUS,W
;Swap status to be saved into W
CLRF
STATUS
;bank 0, regardless of current bank, Clears IRP,RP1,RP0
MOVWF
STATUS_TEMP
;Save status to bank zero STATUS_TEMP register
MOVF
PCLATH, W
;Only required if using pages 1, 2 and/or 3
MOVWF
PCLATH_TEMP
;Save PCLATH into W
CLRF
PCLATH
;Page zero, regardless of current page
BCF
STATUS, IRP
;Return to Bank 0
MOVF
FSR, W
;Copy FSR to W
MOVWF
FSR_TEMP
;Copy FSR from W to FSR_TEMP
:
:(ISR)
:
MOVF
PCLATH_TEMP, W
;Restore PCLATH
MOVWF
PCLATH
;Move W into PCLATH
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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