SM5L1 데이터 시트보기 (PDF) - Sharp Electronics

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SM5L1

4-Bit Single Chip Microcomputers

Sharp Electronics 

4-Bit Single Chip Microcomputers

SM5L1/SM5L2/SM5L3

RELEASE FROM THE STANDBY MODE TO THE

OPERATION MODE

Release from the standby mode to the operation

mode is based on an interrupt request from the INTA

pin or divider overflow. However, the reset is limited to

a nonmaskable interrupt request.

The program restarts from step 0 on page 3. How-

ever, if the IME flag is set, the instruction at step 0 on

page 3 is executed and a subroutine jump is performed

to the interrupt processing routine specified on page 2

according to the type of interrupt.

Even if LOW level input on INTA pin is removed

before 900 command cycles, the stop mode is released.

However, the program will not jump to 20H page,

interrupt process routine.

Interrupt request flag IFA is not set: the program

continues at step 0 of 03H page.

Interrupts

Interrupts originate from an INTA input or divider

overflow. The IFA and IFD flags become interrupt

request flags.

The interrupt block is composed of mask flags (RE0,

RE2), the IME flag and interrupt processing circuit.

As shown in Figure 24, resetting a mask flag enables

the interrupt request flag to be independently masked.

Thus, the mask flags can be used in a program to estab-

lish the interrupt priority. The priority for interrupts gen-

erated simultaneously is shown in Table 5.

INTERRUPT REQUEST

(REQUEST FLAG)

INTA input (IFA)

Divider overflow (IFD)

Table 5. Interrupt Event Summary

JUMP DESTINATION

PAGE

STEP

2

0

2

4

PRIORITY ORDER

1

2

INTERRUPT

ENABLE FLAG

RE0

RE2

MASK FLAGS

RE2 RE0

INTERRUPT

REQUEST FLAGS

STACK REGISTER

PROGRAM COUNTER

INT

SIGNAL

IFA

INTERRUPT

PROCESSING

CIRCUIT

IFD

IME

INTERRUPT

ENABLE FLAG

Figure 24. Interrupt Block

5L1-24

Microcomputer Data Sheet

19

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