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參數(shù)資料
| 型號： | SAF-C868-1RR |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO38 |
| 封裝： | PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 50/70頁 |
| 文件大?。?/td> | 1067K |
| 代理商： | SAF-C868-1RR |
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C868
Data Sheet
54
V 0.2, 2002-01
SFR SCUWDT) consecutively. This double instruction sequence has been implemented
to increase system security.
It must be noted, however, that the watchdog timer is halted during the idle mode and
power-down mode of the processor (see section "Power Saving Modes"). It is not
possible to use the idle mode in combination with the watchdog timer function.
Therefore, even the watchdog timer cannot reset the device when one of the power
saving modes has been entered accidentally.
The time period for an overflow of the Watchdog Timer is programmable in two ways :
– the input frequency to the Watchdog Timer can be selected via bit WDTIN in
register WDTCON to be either f
SYS/2 or fSYS/128.
– the reload value WDTREL for the high byte of WDT can be programmed in register
WDTCON.
The period PWDT between servicing the Watchdog Timer and the next overflow can
therefore be determined by the following formula:
[0.1]
Table 14 lists the possible ranges for the watchdog time which can be achieved using a
certain module clock. Some numbers are rounded to 3 significant digits.
For safety reasons, the user is advised to rewrite WDTCON each time before the
Watchdog Timer is serviced.
Table 14
Watchdog Time Ranges
Reload value
in WDTREL
Prescaler for f
SYS
2 (WDTIN = ‘0’)
128 (WDTIN = ‘1’)
40 MHz
20 MHz
16 MHz
40 MHz
20 MHz
16 MHz
FFH
12.8 s
25.6 s
32.0 s
819.2 s 1.64 ms 2.05 ms
7FH
1.65 ms 3.3 ms
4.13 ms
105.7 ms 211.3 ms 264 ms
00H
3.28 ms 6.55 ms 8.19 ms 209.7 ms 419.4 ms 524 ms
PWDT =
f
SYS
2(1 +WDTIN*6) * (216 - WDTREL * 28)
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相關代理商/技術參數(shù) |
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| SAFC8681SG | 制造商:Infineon Technologies AG 功能描述: |
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| SAF-C868-1SR BA | 功能描述:IC MCU 8BIT ROM/LESS TSSOP-38-1 RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:C5xx/C8xx 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
| SAF-C868-1SRBA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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