參數(shù)資料
型號(hào): pic16cr54c
廠商: Microchip Technology Inc.
英文描述: ROM-Based 8-Bit CMOS Microcontroller Series(8位CMOS微控制器)
中文描述: 基于ROM的8位CMOS微控制器系列(8位的CMOS微控制器)
文件頁數(shù): 28/84頁
文件大小: 654K
代理商: PIC16CR54C
PIC16CR54C
DS40191A-page 28
Preliminary
1998 Microchip Technology Inc.
The Electrical Specifications sections show RC
frequency variation from part to part due to normal
process variation. The variation is larger for larger R
(since leakage current variation will affect RC
frequency more for large R) and for smaller C (since
variation of input capacitance will affect RC frequency
more).
Also, see the Electrical Specifications sections for
variation of oscillator frequency due to V
DD
for given
Rext/Cext values as well as frequency variation due to
operating temperature for given R, C, and V
DD
values.
The oscillator frequency, divided by 4, is available on
the OSC2/CLKOUT pin, and can be used for test
purposes or to synchronize other logic.
FIGURE 7-6:
RC OSCILLATOR MODE
Note:
If you change from this device to
another device, please verify oscillator
characteristics in your application.
V
DD
Rext
Cext
V
SS
OSC1
Internal
clock
OSC2/CLKOUT
Fosc/4
PIC16CR54C
N
7.3
Reset
PIC16CR54C devices may be reset in one of the
following ways:
Power-On Reset (POR)
MCLR reset (normal operation)
MCLR wake-up reset (from SLEEP)
WDT reset (normal operation)
WDT wake-up reset (from SLEEP)
Table 7-3 shows these reset conditions for the PCL
and STATUS registers.
Some registers are not affected in any reset condition.
Their status is unknown on POR and unchanged in
any other reset. Most other registers are reset to a
“reset state” on Power-On Reset (POR), MCLR or
WDT reset. A MCLR or WDT wake-up from SLEEP
also results in a device reset, and not a continuation of
operation before SLEEP.
The TO and PD bits (STATUS <4:3>) are set or
cleared depending on the different reset conditions
(Section 7.7). These bits may be used to determine
the nature of the reset.
Table 7-4 lists a full description of reset states of all
registers. Figure 7-7 shows a simplified block diagram
of the on-chip reset circuit.
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