参数资料
型号: ADE7569ASTZF16
厂商: Analog Devices Inc
文件页数: 84/136页
文件大小: 0K
描述: IC ENERGY METER MCU 16K 64LQFP
标准包装: 1
输入阻抗: *
测量误差: *
电压 - 高输入/输出: *
电压 - 低输入/输出: *
电流 - 电源: *
电源电压: *
测量仪表类型: *
工作温度: *
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 托盘
ADE7566/ADE7569
INTERRUPT VECTORS
When an interrupt occurs, the program counter is pushed onto
the stack, and the corresponding interrupt vector address is loaded
into the program counter. When the interrupt service routine is
complete, the program counter is popped off the stack by a RETI
instruction. This allows program execution to resume from where
it was interrupted. The interrupt vector addresses are shown in
Table 70.
Preliminary Technical Data
CONTEXT SAVING
When the 8052 vectors to an interrupt, only the program counter
is saved on the stack. Therefore, the interrupt service routine
must be written to ensure that registers used in the main
program are restored to their pre-interrupt state. Common
registers that can be modified in the ISR are the accumulator
register and the PSW register. Any general-purpose registers
that are used as scratchpads in the ISR should also be restored
Table 70. Interrupt Vector Addresses
Source
IE0
TF0
Vector Address
0x0003
0x000B
before exiting the interrupt. The following example 8051 code
shows how to restore some commonly used registers:
GeneralISR:
; save the current Accumulator value
IE1
0x0013
PUSH
ACC
TF1
RI + TI
0x001B
0x0023
; save the current status and register
bank selection
TF2 + EXF2
ITEMP (Temperature ADC)
ISPI/I2CI
0x002B
0x0033
0x003B
PUSH
PSW
IPSM (Power Supply)
IADE (Energy Measurement DSP)
IRTC (RTC Interval Timer)
WDT (Watchdog Timer)
0x0043
0x004B
0x0053
0x005B
; service interrupt
; restore the status and register bank
selection
INTERRUPT LATENCY
POP
PSW
The 8051 architecture requires that at least one instruction
execute between interrupts. To ensure this, the 8051 MCU
core hardware prevents the program counter from jumping to
an ISR immediately after completing a RETI instruction or an
; restore the accumulator
POP ACC
RETI
access of the IP and IE registers.
The shortest interrupt latency is 3.25 instruction cycles, 800 ns
with a clock of 4.096 MHz. The longest interrupt latency for a
high priority interrupt results when a pending interrupt is
generated during a low priority interrupt RETI, followed by a
multiply instruction. This results in a maximum interrupt
latency of 16.25 instruction cycles, 4 μs with a clock of 4.096 MHz.
Rev. PrA | Page 84 of 136
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