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| 型号： | EVAL-ADE5169EBZ-2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 98/156页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD5169 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是 |
| 已用 IC / 零件： | ADE5169 |
| 主要属性： | 用于汇编语言和 C 代码的 IAR 工具 |
| 次要属性： | 隔离和非隔离输出选项 |
| 已供物品： | 板，软件 |
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ADE5166/ADE5169/ADE5566/ADE5569
WATCHDOG TIMER
The watchdog timer generates a device reset or interrupt within
a reasonable amount of time if the ADE5166/ADE5169/ADE5566/
ADE5569 enter an erroneous state, possibly due to a program-
ming error or electrical noise. The watchdog is enabled, by default,
with a timeout of 2 sec and creates a system reset if not cleared
within 2 sec. The watchdog function can be disabled by clearing
the watchdog enable bit (WDE, Bit 1) in the watchdog timer SFR
(WDCON, Address 0xC0).
The watchdog circuit generates a system reset or interrupt (WDS,
Bit 2) if the user program fails to set the WDE bit within a pre-
determined amount of time (set by the PRE bits, Bits[7:4]).
The watchdog timer is clocked from the 32.768 kHz external
crystal connected between the XTAL1 and XTAL2 pins.
Table 88. Watchdog Timer SFR (WDCON, Address 0xC0)
Data Sheet
The WDCON SFR can be written to by user software only if the
double write sequence described in Table 88 is initiated on every
write access to the WDCON SFR.
To prevent any code from inadvertently disabling the watchdog,
a watchdog protection can be activated. This watchdog protection
locks in the watchdog enable and event settings so they cannot
be changed by user code. The protection is activated by clearing
a watchdog protection bit in the flash memory. The watchdog
protection bit is the most significant bit at Address 0xF7FF of
the flash memory. When this bit is cleared, the WDIR bit (Bit 3) is
forced to 0, and the WDE bit is forced to 1. Note that the sequence
for configuring the flash protection bits must be followed to
modify the watchdog protection bit at Address 0xF7FF (see the
Protecting the Flash Memory section).
Bit
[7:4]
Address
0xC7 to 0xC4
Mnemonic
PRE
Default
7
Description
Watchdog prescaler. In normal mode, the 16-bit watchdog timer is clocked by the input
clock (32.768 kHz). The PRE bits determine which of the upper bits of the counter are used
as the watchdog output, as follows:
t WATCHDOG = 2 PRE ×
PRE
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010 to 1111
2 9
XTAL1
Result (Watchdog Timeout)
15.6 ms
31.2 ms
62.5 ms
125 ms
250 ms
500 ms
1 sec
2 sec
0 sec, automatic reset
0 sec, serial download reset
Not a valid selection
3
0xC3
WDIR
0
Watchdog interrupt response bit. When cleared, the watchdog generates a system reset
when the watchdog timeout period has expired. When set, the watchdog generates an
interrupt when the watchdog timeout period has expired.
2
0xC2
WDS
0
Watchdog status bit. This bit is set to indicate that a watchdog timeout has occurred. It is
cleared by writing a 0 or by an external hardware reset. A watchdog reset does not clear
WDS; therefore, it can be used to distinguish between a watchdog reset and a hardware
reset from the RESET pin.
1
0xC1
WDE
1
Watchdog enable bit. When set, this bit enables the watchdog and clears its counter. The
watchdog counter is subsequently cleared again whenever WDE is set. If the watchdog is
not cleared within its selected timeout period, it generates a system reset or watchdog
interrupt, depending on the WDIR bit.
0
0xC0
WDWR
0
Watchdog write enable bit (see the Writing to the Watchdog Timer SFR (WDCON, Address
0XC0) section).
Rev. D | Page 98 of 156
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相关代理商/技术参数 |
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| EVAL-ADE5169F62EBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR ADE5169 - Boxed Product (Development Kits) 制造商:Rochester Electronics LLC 功能描述: |
| EVAL-ADE5569F62EBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver |
| EVAL-ADE7169EBZ-2 | 功能描述:BOARD EVALUATION FOR ADE7169F16 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| EVAL-ADE7169F16EB | 制造商:AD 制造商全称:Analog Devices 功能描述:Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
| EVAL-ADE7169F16EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For ADE7169 制造商:Analog Devices 功能描述:EVAL BD FOR ADE7169 - Bulk |
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