参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 137/153页
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SSOP
标准包装: 2,100
系列: PIC® 14
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C
外围设备: POR,温度传感器,WDT
输入/输出数: 20
程序存储器容量: 7KB(4K x 14)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
数据转换器: 斜率 A/D
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
PIC14000
DS40122B-page 84
Preliminary
1996 Microchip Technology Inc.
10.6.2
TIMER0 INTERRUPT
An overow (FFh
→ 00h) in Timer0 will set the T0IF
(INTCON<2>)
ag.
Setting
T0IE
(INTCON<5>)
enables the interrupt.
10.6.3
PORTC INTERRUPT ON CHANGE
An
input
change
on
PORTC<7:4>
sets
RCIF
(PIR1<2>). Setting RCIE (PIE1<2>) enables the inter-
rupt. For operation of PORTC, refer to Section 5.2.
Note:
If a change on the I/O pin should occur
when the read operation is being executed
(start of the Q2 cycle), then the RCIF
interrupt ag may not be set.
10.6.4
CONTEXT SWITCHING 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, for example, W register
and Status register. Example 10-1 is an example that
shows saving registers in RAM.
EXAMPLE 10-1: SAVING STATUS AND W REGISTERS IN RAM
MOVWF
W_TEMP
;Copy W to TEMP register, could be any bank
SWAPF
STATUS,W
;Swap status to be saved into W
BCF
STATUS,RP1
;Change to bank zero, regardless of current bank
BCF
STATUS,RP0
;
MOVWF
STATUS_TEMP
;Save status to bank zero STATUS_TEMP 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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