參數(shù)資料
型號: AT90S1200A-4SC
廠商: Atmel
文件頁數(shù): 16/71頁
文件大小: 0K
描述: MCU 1K FLASH 4MHZ LV 20-SOIC
標準包裝: 37
系列: AVR® 90S
核心處理器: AVR
芯體尺寸: 8-位
速度: 4MHz
連通性: SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 15
程序存儲器容量: 1KB(512 x 16)
程序存儲器類型: 閃存
EEPROM 大小: 64 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
23
AT90S1200
0838H–AVR–03/02
Watchdog Timer
The Watchdog Timer is clocked from a separate On-chip Oscillator that runs at 1 MHz.
This is the typical value at V
CC = 5V. See characterization data for typical values at other
V
CC levels. By controlling the Watchdog Timer prescaler, the Watchdog Reset interval
can be adjusted, see Table 6 for a detailed description. The WDR (Watchdog Reset)
instruction resets the Watchdog Timer. Eight different clock cycle periods can be
selected to determine the maximum period between two WDR instructions to prevent
the Watchdog Timer from resetting the MCU. If the reset period expires without another
WDR instruction, the AT90S1200 resets and executes from the Reset Vector. For timing
details on the Watchdog Reset, refer to page 14.
Figure 20. Watchdog Timer
Watchdog Timer Control
Register – WDTCR
Bits 7..4 – Res: Reserved Bits
These bits are reserved bits in the AT90S1200 and will always read as zero.
Bit 3 – WDE: Watchdog Enable
When the WDE is set (one) the Watchdog Timer is enabled, and if the WDE is cleared
(zero) the Watchdog Timer function is disabled.
Bits 2..0 – WDP2..0: Watchdog Timer Prescaler 2, 1 and 0
The WDP2..0 determine the Watchdog Timer prescaling when the Watchdog Timer is
enabled. The different prescaling values and their corresponding timeout periods are
shown in Table 6.
Bit
765
432
10
$21
–––
WDE
WDP2
WDP1
WDP0
WDTCR
Read/Write
R
R/W
Initial Value
0
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