參數(shù)資料
型號： MC80C52CXXX-30P883
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CDIP40
封裝： 0.600 INCH, SIDE BRAZED, DIP-40
文件頁數(shù)： 7/81頁
文件大小： 663K
代理商： MC80C52CXXX-30P883
15
ATtiny28L/V
1062F–AVR–07/06
System Control and
Reset
Reset Sources
The ATtiny28 provides three sources of reset:
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on
Reset threshold (V
POT).
External Reset. The MCU is reset when a low level is present on the RESET pin for
more than 50 ns.
Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and
the Watchdog is enabled.
During reset, all I/O registers are then set to their initial values and the program starts
execution from address $000. The instruction placed in address $000 must be an RJMP
(relative jump) instruction to the reset handling routine. If the program never enables an
interrupt source, the interrupt vectors are not used, and regular program code can be
placed at these locations. The circuit diagram in Figure 16 shows the reset logic. Table 4
defines the timing and electrical parameters of the reset circuitry.
Figure 16. Reset Logic
Note:
1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling).
Table 4. Reset Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
V
POT
Power-on Reset Threshold Voltage (rising)
1.0
1.4
1.8
V
Power-on Reset Threshold Voltage (falling)
0.4
0.6
0.8
V
RST
RESET Pin Threshold Voltage
0.6 VCC
V
Power-on
Reset Circuit
Watchdog
Timer
On-chip
RC Oscillator
VCC
RESET
100 - 500K
Delay Counters
CK
CKSEL[3..0]
S
R
Q
Full
INTERNAL
RESET
COUNTER
RESET
MCU Control and Status
Register (MCUCS)
PORF
EXTRF
WDRF
DATA BUS
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