参数资料
型号: ATAM893T-TKQ
厂商: Atmel
文件页数: 5/98页
文件大小: 0K
描述: IC MON TIRE-PRESS ATARX9X SER
标准包装: 4,000
系列: MARC4
核心处理器: MARC4
芯体尺寸: 4-位
速度: 4MHz
连通性: SSI(2 线,3 线)
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 16
程序存储器容量: 4KB(4K x 8)
程序存储器类型: EEPROM
EEPROM 大小: 64 x 16
RAM 容量: 256 x 4
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 6.5 V
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 20-SOIC(0.209",5.30mm 宽)
包装: 带卷 (TR)
13
4680C–4BMCU–01/05
ATAM893-D
Figure 4-8.
Brown-out Detection
4.3.2
Watchdog Reset
The watchdog's function can be enabled at the WDC register and triggers a reset with every
watchdog counter overflow. To suppress the watchdog reset, the watchdog counter must be
regularly reset by reading the watchdog register address (CWD). The CPU reacts in exactly the
same manner as a reset stimulus from any of the above sources.
4.3.3
External Clock Supervisor
The external input clock supervisor function can be enabled if the external input clock is selected
within the CM and SC registers of the clock module. The CPU reacts in exactly the same man-
ner as a reset stimulus from any of the above sources.
4.4
Voltage Monitor
The voltage monitor consists of a comparator with an internal voltage reference. It is used to
supervise the supply voltage or an external voltage at the VMI pin. The comparator for the sup-
ply voltage has three internal programmable thresholds: one lower threshold (2.2 V), one middle
threshold (2.6 V) and one higher threshold (3.0 V). For external voltages at the VMI pin, the
comparator threshold is set to V
BG = 1.3 V. The VMS bit indicates if the supervised voltage is
below (VMS = 0) or above (VMS = 1) this threshold. An interrupt can be generated when the
VMS bit is set or reset to detect a rising or falling slope. A voltage monitor interrupt (INT7) is
enabled when the interrupt mask bit (VIM) is reset in the VMC register.
V
DD
CPU
Reset
t
BOT = 1
2.0 V
1.7 V
CPU
Reset
BOT = 0
t
d
t
d = 1.5 ms (typically)
BOT = 1, low brown-out voltage threshold 1.7 V (is reset value).
BOT = 0, high brown-out voltage threshold 2.0 V.
t
d
t
d
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