参数资料
型号: PIC14000-04I/SO
厂商: Microchip Technology
文件页数: 138/153页
文件大小: 0K
描述: IC MCU OTP 4KX14 A/D 28SOIC
产品培训模块: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
标准包装: 27
系列: PIC® 14
核心处理器: PIC
芯体尺寸: 8-位
速度: 4MHz
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: -40°C ~ 85°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
309-1073-ND - ADAPTER 28-SOIC TO 28-SOIC
309-1024-ND - ADAPTER 28-SOIC TO 28-DIP
309-1023-ND - ADAPTER 28-SOIC TO 28-DIP
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 85
PIC14000
10.7
Watchdog Timer (WDT)
The watchdog timer is realized as a free running
on-chip RC oscillator which does not require any
external components. This RC oscillator is separate
from the IN oscillator used to generate the CPU and
A/D clocks. That means that the WDT will run even if
the clock has been stopped, for example, by execution
of a SLEEP instruction. Refer to Section 10.8.1 for more
information.
During normal operation, a WDT time-out generates a
device RESET. If the device is in SLEEP mode, a WDT
time-out causes the device to wake-up and continue
with normal operation.
The
WDT
can
be
permanently
disabled
by
programming the conguration bit WDTE as a ‘0’. Its
oscillator can be shut down to conserve battery power
by
entering
HIBERNATE
Mode.
Refer
to
Section 10.8.3 for more information on HIBERNATE
mode.
A block diagram of the watchdog timer is shown in
Figure 10-11. It should be noted that a RESET
generated by the WDT time-out does not drive MCLR
low.
CAUTION: Beware of disabling WDT if software
routines require exiting based on WDT
reset. For example, the MCU will not
exit HIBERNATE mode based on WDT
reset.
FIGURE 10-11: WATCHDOG TIMER BLOCK DIAGRAM (WITH TIMER0)
RC3/T0CKI
T0SE
0
1
0
pin
T0CS
FOSC/4
Sync with
Internal
clocks
TMR0
PSout
(2 cycle delay)
PSout
Data bus
8
PSA
Set T0IF
Interrupt on
Overow
8-bit Counter
8-to-1 MUX
18 mS
Timer
PSA
0
1
WDT
Time-out
PS2:PS0
8
Note: T0CS, T0SE, PSA, PS2:PS0 correspond to (OPTION<5:0>).
PSA
0
1
3
HIBERNATE
WDT
Enable Bit
Local
Oscillator
Prescaler/
Postscaler
Enable
Watchdog Timer
Timer0
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