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参数资料
| 型号： | SM5L3 |
| 厂商： | SHARP ELECTRONICS CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4-BIT, MROM, MICROCONTROLLER, PQFP80 |
| 封装： | 14 X 20 MM, PLASTIC, QFP-80 |
| 文件页数： | 11/27页 |
| 文件大小： | 164K |
| 代理商： | SM5L3 |
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4-Bit Single Chip Microcomputers
SM5L1/SM5L2/SM5L3
Microcomputer Data Sheet
19
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.
Table 5. Interrupt Event Summary
INTERRUPT REQUEST
(REQUEST FLAG)
JUMP DESTINATION
PRIORITY ORDER
INTERRUPT
ENABLE FLAG
PAGE
STEP
INTA input (IFA)
2
0
1
RE0
Divider overflow (IFD)
2
4
2
RE2
Figure 24. Interrupt Block
MASK FLAGS
INTERRUPT
REQUEST FLAGS
RE2
IFA
IFD
IME
INTERRUPT
ENABLE FLAG
INTERRUPT
PROCESSING
CIRCUIT
INT
SIGNAL
STACK REGISTER
PROGRAM COUNTER
RE0
5L1-24
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