参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 130/153页
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SSOP
标准包装: 2,100
系列: PIC® 14
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C
外围设备: POR,温度传感器,WDT
输入/输出数: 20
程序存储器容量: 7KB(4K x 14)
程序存储器类型: OTP
RAM 容量: 192 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
数据转换器: 斜率 A/D
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
PIC14000
DS40122B-page 78
Preliminary
1996 Microchip Technology Inc.
Figure 10-6 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental
frequency of the crystal. The inverter performs a
180-degree phase shift in a series resonant oscillator
circuit. The 330 k
resistors provide the negative
feedback to bias the inverters in their linear region.
FIGURE 10-6: EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
330k
74AS04
PIC14000
OSC1
To Other
Devices
XTAL
330k
74AS04
0.1
F
10.3
Reset
The PIC14000 differentiates between various kinds of
reset:
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during SLEEP
WDT Reset (normal operation)
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), on the MCLR and
WDT Reset, and on MCLR Reset during SLEEP. They
are not affected by a WDT Wake-up, which is viewed
as the resumption of normal operation. The TO and PD
bits are set or cleared differently in different reset situ-
ations as indicated in Table 10-3. These bits are used
in software to determine the nature of the reset. See
Table 10-5 for a full description of reset states of all reg-
isters.
A simplied block diagram of the on-chip reset circuit is
shown in Figure 10-7.
The devices all have a MCLR noise lter in the MCLR
reset path. The lter will detect and ignore small pulses.
It should be noted that a WDT Reset does not drive
MCLR pin low.
FIGURE 10-7: SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
S
R
Q
External
Reset
MCLR
VDD
OSC1
WDT
Module
VDD rise
detect
OST/PWRT
On-chip(1)
RC OSC
WDT
Time-out
Power-on Reset
OST
10-bit Ripple counter
PWRT
Chip_Reset
10-bit Ripple counter
Enable OST
Enable PWRT
SLEEP
Note
1: This is a separate oscillator from the RC
oscillator of the CLKIN pin.
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