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| 型号： | MM908E622ACDWB/R2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO54 |
| 封装： | 17.90 X 7.50 MM, 0.65 MM PITCH, PLASTIC, SOIC-54 |
| 文件页数： | 41/66页 |
| 文件大小： | 1277K |
| 代理商： | MM908E622ACDWB/R2 |
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Analog Integrated Circuit Device Data
46
Freescale Semiconductor
908E622
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
ECF— EC pin Failure Bit
This read only bit is set if a fail condition on the
electrochrome output is present
1 = EC pin fail
0 = EC normal operating
Figure 29. ECF flag generation
WINDOW WATCHDOG
The window watchdog is to supervise the device and to
recover from (e.g. code runaways) or similar conditions.
The use of a window watchdog adds additional safety as
the watchdog clear has not only to occur, but to be done at a
certain time frame / window.
Normal Mode
The window watchdog function is only available in Normal
mode, and is halted in Stop and Sleep mode. Upon setting
the WDRE bit, the watchdog functionality is activated. Once
this function is enabled, it is not possible to disable it via
software. Reset clears the WDRE bit.
To prevent a Watchdog reset, the Watchdog timer has to
be cleared in the Window Open frame. This is done by writing
a logic “1” to the WDRST bit in the Watchdog Control register
(WDCTL). The actual reset of the watchdog counter occurs at
the end of the corresponding SPI transmission, with the rising
edge of the SS signal.
If the watchdog is enabled, it will generate a system reset
when the timer has reached its end value, or if a watchdog
reset (WDRST) has occurred in the closed window.
The watchdog period can be selected with 2 bits in the
WDCTL, in order to get 10ms, 20ms, 40ms, and 80ms
periods.
Figure 30. Window Watchdog Period
Stop Mode
Operations of the watchdog function is ceased in stop
mode (counter/oscillator stopped). After a wake-up, the
watchdog timer is automatically cleared, in order to give the
MCU the full time to reset the watchdog.
Sleep Mode
Operations of the watchdog function are halted in sleep
mode. Due to the main voltage regulator asserting an LVR
reset, the Watchdog functionality is disabled, and the WDRE
bit is cleared as soon as sleep mode is entered. To reenable
this function bit WDRE has to be set after wake-up.
Watchdog Control Register (WDCTL)
WDRE - Watchdog Reset Enable Bit
This read/write (write once) bit activates the watchdog The
WDRE can only be set and can’t be cleared by software.
Reset clears the WDRE bit.
1 = Watchdog enabled
0 = Watchdog disabled
WDP1:0 - Watchdog Period Select Bits
This read/write bit select the clock rate of the Watchdog.
Reset clears the WDP1:0 bits.
Table 12. Watchdog Period Selection Bits
WDRST - Watchdog Reset Bit
This write only bit resets the Watchdog. Write a logic [1] to
reset the watchdog timer.
1 = Reset WD and restart timer
0 = no effect
Voltage Regulator
The 908E622 contains a low power, low drop voltage
regulator to provide internal power and external power for the
ECOCF
ECOLF
ECF
Window closed
no watch dog clear allowed
Window open
for watch dog clear
WD timing x 50%
WD period ( timing selected by Bits WDP1:0)
Register Name and Address: WDCTL - $0B
Bit7
6
5
4
3
2
1
Bit0
Read WDR
E
WDP
1
WDP
0
000
0
Write
WDR
ST
Reset
0
WDP1
WDP0
Mode
0
80ms window watchdog period
0
1
40ms window watchdog period
1
0
20ms window watchdog period
1
10ms window watchdog period
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MM908E622ACEK | 功能描述:8位微控制器 -MCU QUAD H-B TRIHS EC GLASS RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| MM908E622ACPEK | 功能描述:IC QUAD HALF BRDG TRPL SW 54SOIC RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:- 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网，UART，USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382 |
| MM908E622ACPEKR2 | 功能描述:8位微控制器 -MCU QUAD H-B, TRIHS, EC RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| MM908E624 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:TRIPLE HIGH-SIDE SWITCH WITH EMBEDDED MCU AND LIN |
| MM908E624ACDWB | 功能描述:IC TRPL SWITCH MCU/LIN 54-SOIC RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:- 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网，UART，USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382 |
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