参数资料
型号: SAK-XC2237M-104F40L
厂商: Infineon Technologies
文件页数: 57/107页
文件大小: 0K
描述: IC MCU 16BIT 320KB FLASH 64LQFP
标准包装: 1,900
系列: XC22xxM
核心处理器: C166SV2
芯体尺寸: 16/32-位
速度: 40MHz
连通性: CAN,EBI/EMI,I²C,LIN,SPI,SSC,UART/USART,USI
外围设备: I²S,POR,PWM,WDT
输入/输出数: 38
程序存储器容量: 832KB(832K x 8)
程序存储器类型: 闪存
RAM 容量: 50K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 9x10b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 64-LQFP
包装: 带卷 (TR)
其它名称: SP000720382
XC2238M, XC2237M
XC2000 Family / Base Line
Functional Description
Data Sheet
53
V2.1, 2011-07
3.15
Watchdog Timer
The Watchdog Timer is one of the fail-safe mechanisms which have been implemented
to prevent the controller from malfunctioning for longer periods of time.
The Watchdog Timer is always enabled after an application reset of the chip. It can be
disabled and enabled at any time by executing the instructions DISWDT and ENWDT
respectively. The software has to service the Watchdog Timer before it overflows. If this
is not the case because of a hardware or software failure, the Watchdog Timer
overflows, generating a prewarning interrupt and then a reset request.
The Watchdog Timer is a 16-bit timer clocked with the system clock divided by 16,384
or 256. The Watchdog Timer register is set to a prespecified reload value (stored in
WDTREL) in order to allow further variation of the monitored time interval. Each time it
is serviced by the application software, the Watchdog Timer is reloaded and the
prescaler is cleared.
Time intervals between 3.2
μs and 13.42 s can be monitored (@ 80 MHz).
The default Watchdog Timer interval after power-up is 6.5 ms (@ 10 MHz).
3.16
Clock Generation
The Clock Generation Unit can generate the system clock signal
f
SYS for the XC223xM
from a number of external or internal clock sources:
External clock signals with pad voltage or core voltage levels
External crystal or resonator using the on-chip oscillator
On-chip clock source for operation without crystal/resonator
Wake-up clock (ultra-low-power) to further reduce power consumption
The programmable on-chip PLL with multiple prescalers generates a clock signal for
maximum system performance from standard crystals, a clock input signal, or from the
on-chip clock source. See also Section 4.6.2.
The Oscillator Watchdog (OWD) generates an interrupt if the crystal oscillator frequency
falls below a certain limit or stops completely. In this case, the system can be supplied
with an emergency clock to enable operation even after an external clock failure.
All available clock signals can be output on one of two selectable pins.
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