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參數(shù)資料
| 型號(hào)： | ST52E430B/D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, UVPROM, 20 MHz, MICROCONTROLLER, CDIP32 |
| 封裝： | WINDOWED, SHRINK, CERAMIC, DIP-32 |
| 文件頁(yè)數(shù)： | 50/120頁(yè) |
| 文件大?。?/td> | 502K |
| 代理商： | ST52E430B/D |
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ST52T430/E430
5.2 RESET
There are two sources of Reset:
- RESET pin (external source.)
- WATCHDOG (internal source)
When a Reset event happens, the user program
restarts from the beginning.
The Reset pin is an input. An internal reset does not
affect this pin.
A Reset signal originated by external sources is
instantaneously recognized. The RESET pin may
be used to ensure Vdd has risen to a point where
the MCU can operate correctly before the user
program is run. In working mode the Reset must
be set to ‘1’ (see Table 2.1)
5.3 Power Saving Mode
There are two Power Saving modes: WAIT and
HALT mode. These conditions may be entered
using the WAIT or HALT instructions.
5.3.1 Wait Mode
Wait mode places the MCU in a low power
consumption by stopping the CPU. All peripherals
and the watchdog remain active. During the WAIT
mode, the Interrupts are enabled. The MCU will
remain in Wait mode until an Interrupt or a RESET
occurs, whereupon the Program Counter jumps to
the interrupt service routine or, if a RESET occurs,
at the beginning of the user program.
WATCHDOG RESET
RESET
INTERNAL
RESET
Figure 5.2 Reset Block Diagram
OSCILLATOR
PERIPHERALS CLOCK
CPU CLOCK
INTERRUPTS
ON
OFF
ENAB.
WAIT ISTRUCTION
RESET
INTERRUPT
YES
NO
CPU CLOCK
ON
PROGRAM COUNTER RESET
NO
JUMP TO INT. ROUTINE
CPU CLOCK
ON
NORMAL PROGRAM FLOW
Figure 5.3 WAIT Flow Chart
Vcc
100 F
10k
2.2k
1 F
RESET
Figure 5.4 Simple Reset Circuit
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