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参数资料
型号： PIC18F45J50T-I/ML
厂商： Microchip Technology
文件页数： 128/164页
文件大小： 0K
描述： IC PIC MCU FLASH 32KB 44-QFN
产品培训模块： PIC18 J Series MCU Overview
标准包装： 1,600
系列： PIC® XLP™ 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 48MHz
连通性： I²C，SPI，UART/USART，USB
外围设备： 欠压检测/复位，DMA，POR，PWM，WDT
输入/输出数： 34
程序存储器容量： 32KB（16K x 16）
程序存储器类型： 闪存
RAM 容量： 3.8K x 8
电压 - 电源 (Vcc/Vdd)： 2.15 V ~ 3.6 V
数据转换器： A/D 13x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 44-VQFN 裸露焊盘
包装： 带卷 (TR)
PIC18F46J50 FAMILY
DS39931D-page 66
2011 Microchip Technology Inc.
5.5
Configuration Mismatch (CM)
The Configuration Mismatch (CM) Reset is designed to
detect, and attempt to recover from, random memory
corrupting
events.
These
include
Electrostatic
Discharge (ESD) events, which can cause widespread
single-bit changes throughout the device, and result in
catastrophic failure.
In PIC18FXXJ Flash devices, the device Configuration
registers (located in the configuration memory space)
are continuously monitored during operation by com-
paring their values to complimentary shadow registers.
If a mismatch is detected between the two sets of
registers, a CM Reset automatically occurs. These
events are captured by the CM bit (RCON<5>). The
state of the bit is set to ‘0’ whenever a CM event occurs;
it does not change for any other Reset event.
A CM Reset behaves similarly to a MCLR, RESET
instruction, WDT time-out or Stack Event Resets. As
with all hard and power Reset events, the device
Configuration Words are reloaded from the Flash
Configuration Words in program memory as the device
restarts.
5.6
Power-up Timer (PWRT)
PIC18F46J50 family devices incorporate an on-chip
PWRT to help regulate the POR process. The PWRT is
always enabled. The main function is to ensure that the
device voltage is stable before code is executed.
The Power-up Timer (PWRT) of the PIC18F46J50 fam-
ily devices is a 5-bit counter which uses the INTRC
source as the clock input. This yields an approximate
time interval of 32 x 32
s = 1 ms. While the PWRT is
counting, the device is held in Reset.
The power-up time delay depends on the INTRC clock
and will vary from chip-to-chip due to temperature and
process variation. See DC Parameter 33 (TPWRT) for
details.
5.6.1
TIME-OUT SEQUENCE
The PWRT time-out is invoked after the POR pulse has
cleared. The total time-out will vary based on the status
of the PWRT. Figure 5-2, Figure 5-3, Figure 5-4 and
Figure 5-5 all depict time-out sequences on power-up
with the PWRT.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the PWRT will expire. Bringing
MCLR high will begin execution immediately if a clock
source is available (Figure 5-4). This is useful for
testing purposes, or to synchronize more than one
PIC18F device operating in parallel.
FIGURE 5-2:
TIME-OUT SEQUENCE ON POWER-UP (MCLR TIED TO VDD, VDD RISE < TPWRT)
TPWRT
VDD
MCLR
INTERNAL POR
PWRT TIME-OUT
INTERNAL RESET
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