參數(shù)資料
型號(hào): UPD78323
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16/8-BIT單片機(jī)
文件頁(yè)數(shù): 43/86頁(yè)
文件大?。?/td> 454K
代理商: UPD78323
43
μ
PD78323, 78324
4.2
MACRO SERVICE
The macro service function is executed at the interrupt request to carry out data operation and data transfer in hardware
terms between the special function register area and the memory space.
Upon startup of the macro service, the CPU stops program execution temporarily. 1-byte/2-byte data operation and
transfer are automatically carried out between the special function register (SFR) and the memory. Upon termination of the
macro service, the interrupt request flag is reset to 0 and the CPU restarts program execution. When the CPU carries out
the macro service operations as many as set into the macro service counter (MSC), a vectored interrupt request is generated.
Figure 4-2. Macro Service Processing Sequence Example
; Data Transfer, and Realtime
Output Port Control
Macro Service Processing
Interrupt Request Generated
Macro service execution
MSC
MSC–1
MSC = 0
Yes
No
ISM
×× ←
0
Next Instruction Executed
Interrupt request flag
0
; Macro Service Counter (MSC)
Decrement (by 1)
Vectored Interrupt Request Occurred
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