参数资料
型号: TS80C51RD2-MIE
厂商: Atmel
文件页数: 79/84页
文件大小: 0K
描述: IC MCU 8BIT 768BYTE 40MHZ 44VQFP
标准包装: 800
系列: 80C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40/20MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器类型: ROMless
RAM 容量: 768 x 8
电压 - 电源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 44-QFP
包装: 托盘
dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
DS70292G-page 82
2007-2012 Microchip Technology Inc.
FIGURE 6-2:
SYSTEM RESET TIMING
Reset
Run
Device Status
VDD
VPOR
Vbor
VBOR
POR
BOR
SYSRST
TPWRT
TPOR
TBOR
Oscillator Clock
TOSCD
TOST
TLOCK
Time
FSCM
TFSCM
1
2
3
4
5
6
Note 1: POR: A POR circuit holds the device in Reset when the power supply is turned on. The POR circuit is active
until VDD crosses the VPOR threshold and the delay TPOR has elapsed.
2: BOR: The on-chip voltage regulator has a BOR circuit that keeps the device in Reset until VDD crosses the
VBOR threshold and the delay TBOR has elapsed. The delay TBOR ensures the voltage regulator output
becomes stable.
3: PWRT Timer: The programmable power-up timer continues to hold the processor in Reset for a specific
period of time (TPWRT) after a BOR. The delay TPWRT ensures that the system power supplies have stabilized
at the appropriate level for full-speed operation. After the delay TPWRT has elapsed, the SYSRST becomes
inactive, which in turn enables the selected oscillator to start generating clock cycles.
4: Oscillator Delay: The total delay for the clock to be ready for various clock source selections are given in
5: When the oscillator clock is ready, the processor begins execution from location 0x000000. The user
application programs a GOTO instruction at the reset address, which redirects program execution to the
appropriate start-up routine.
6: The Fail-Safe Clock Monitor (FSCM), if enabled, begins to monitor the system clock when the system clock
is ready and the delay TFSCM elapsed.
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