Epson S1C6200A Specifikace stáhnout pdf (Strana 227)

S1C62740 TECHNICAL SOFTWARE EPSON II-75

CHAPTER 6: PERIPHERAL CIRCUITS (Interrupt)

;

SERK1:

; DO THE INPUT K1 INTERRUPT

; SERVICE ROUTINE HERE

RET

;

SERSIO:

; DO THE SIO INTERRUPT

; SERVICE ROUTINE HERE

RET

;

SERPT:

; DO THE PROGRAMMABLE TIMER INTERRUPT

; SERVICE ROUTINE HERE

RET

;

(1) The interrupt factor flag is set when the interrupt conditions are

established, regardless of the setting of the interrupt mask

(2) Read the interrupt factor flag in the DI status (interrupt flag =

"0"). Reading of interrupt factor flag is available at EI, but be

careful in the following cases.

If the interrupt mask register value corresponding to the inter-

rupt factor flags to be read is set to "1", an interrupt request will

be generated by the interrupt factor flags set timing, or an

interrupt request will not be generated. Be very careful when

interrupt factor flags are in the same address.

(3) Be sure that writing to the interrupt mask register is done with

the interrupt in the DI status (interrupt flag = "0"). Writing to

the interrupt mask register while in the EI status (interrupt flag

= "1") may cause malfunction.

(4) When multiple interrupts simultaneously occur, the high

priority vector address is set to the program counter.

Programming notes

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Epson S1C6200A Specifikace Strana 227