UPD78323 NEC, UPD78323 Datasheet - Page 43

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

4.2
terms between the special function register area and the memory space.
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.
The macro service function is executed at the interrupt request to carry out data operation and data transfer in hardware
Upon startup of the macro service, the CPU stops program execution temporarily. 1-byte/2-byte data operation and
MACRO SERVICE
Vectored Interrupt Request Occurred
ISM
Figure 4-2. Macro Service Processing Sequence Example
0
Yes
Interrupt Request Generated
Macro Service Processing
Macro service execution
MSC
MSC = 0?
MSC–1
No
; Data Transfer, and Realtime
; Macro Service Counter (MSC)
Output Port Control
Decrement (by 1)
Interrupt request flag
Next Instruction Executed
PD78323, 78324
0
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