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5.1.3
Program cache memory
(1) Definition
This memory is for program operation
The CPU module transfers a program from the program memory to the program cache memory for
operation.
The program is transferred from the program memory to the program cache memory during:
• initial processing after the CPU module is powered on, or
• initial processing after the CPU module is reset.
Figure 5.5 provides the flow of program operations.
5 - 8
Universal model QCPU
1) Transfer
<Drive 0>
Program
Program
memory
cache
(Flash ROM)
memory
(SRAM)
2) Operation
processing
<Drive 3>
<Drive 4>
Standard
Standard
ROM
RAM (SRAM)
refresh area
(Flash ROM)
Figure 5.5 Flow of program operation
.
Power-on/reset
Initial Processing
(transfers data in the
program memory to the
program cache memory.)
I/O module refresh
processing
Operation processing
Multiple
of the program
CPU auto
END processing
Execution order can be changed.
Operation processing
of program A
Operation processing
of program B
Operation processing
of program C
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