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參數(shù)資料
| 型號： | M44C892-H |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁數(shù)： | 5/84頁 |
| 文件大?。?/td> | 648K |
| 代理商： | M44C892-H |
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M44C892–H
M44C892–H
M44C092–H
Rev. A2, 14-Dec-01
13 (84)
Reset
timer
V
DD
CL
Power–on
reset
Internal
reset
res
CL=SYSCL/4
V
DD
V
SS
Brown–out
detection
V
DD
V
SS
Watch–
dog
CWD
res
Ext. clock
supervisor
ExIn
Pull-up
NRST
13752
Figure 9. Reset configuration
2.3.1
Power-on Reset and Brown-out
Detection
The M44C092–H / M44C892–H has a fully integrated
power-on reset and brown-out detection circuitry. For re-
set generation no external components are needed .
These circuits ensure that the core is held in the reset state
until the minimum operating supply voltage has been
reached. A reset condition will also be generated should
the supply voltage drop momentarily below the minimum
operating level except when a power down mode is
activated (the core is in SLEEP mode and the peripheral
clock is stopped). In this power-down mode the brown-
out detection is disabled.
Two values for the brown-out voltage threshold are
programmable via the BOT-bit in the SC-register.
V
DD
CPU
Reset
t
BOT = ’1’
2.0 V
1.7 V
CPU
Reset
BOT = ’0’
t
d
t
d
t
d
= 1.5 ms (typically)
t
d
13753
BOT = 1, low brown-out voltage threshold. (1.7 V) is reset value.
BOT = 0, high brown-out voltage threshold (2.0 V).
Figure 10. Brown-out detection
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