PIC16CE625 Datasheet

IC型号：
PIC16CE625
PDF描述：
OTP 8-Bit CMOS MCU with EEPROM Data Memory
文件大小：
1208.41KB
PDF页数：
113页
芯片厂家：

阅览下载纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108

PIC16CE62X

10.6

Context Saving During Interrupts

10.7

Watchdog Timer (WDT)

During an interrupt, only the return PC value is saved

on the stack. Typically, users may wish to save key reg-

isters during an interrupt e.g. W register and STATUS

Example 10-1 stores and restores the STATUS and W

registers. The user register, W_TEMP, must be de铿乶ed

in both banks and must be de铿乶ed at the same offset

from the bank base address (i.e., W_TEMP is de铿乶ed

at 0x70 in Bank 0 and it must also be de铿乶ed at 0xF0

in Bank 1). The user register, STATUS_TEMP, must be

de铿乶ed in Bank 0. The Example 10-1:

Stores the W register

Stores the STATUS register in Bank 0

Executes the ISR code

Restores the STATUS (and bank select bit

鈥?Restores the W register

鈥?/div>

The watchdog timer is a free running on-chip RC oscil-

lator which does not require any external components.

This RC oscillator is separate from the RC oscillator of

the CLKIN pin. That means that the WDT will run, even

if the clock on the OSC1 and OSC2 pins of the device

has been stopped, for example, by execution of a

SLEEP

instruction. 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 con-

铿乬uration bit WDTE as clear (Section 10.1).

10.7.1

WDT PERIOD

EXAMPLE 10-1: SAVING THE STATUS AND

W REGISTERS IN RAM

MOVWF

SWAPF

BCF

MOVWF

SWAPF

STATUS_TEMP,W

;swap STATUS_TEMP register

;into W, sets bank to original

;state

;move W into STATUS register

;swap W_TEMP

;swap W_TEMP into W

(ISR)

W_TEMP

STATUS,W

STATUS,RP0

STATUS_TEMP

;copy W to temp register,

;could be in either bank

;swap status to be saved into W

;change to bank 0 regardless

;of current bank

;save status to bank 0

;register

The WDT has a nominal time-out period of 18 ms, (with

no prescaler). The time-out periods vary with tempera-

ture, V

and process variations from part to part (see

DC specs). If longer time-out periods are desired, a

prescaler with a division ratio of up to 1:128 can be

assigned to the WDT under software control by writing

to the OPTION register. Thus, time-out periods up to

2.3 seconds can be realized.

The

CLRWDT

and

SLEEP

instructions clear the WDT

and the postscaler, if assigned to the WDT, and prevent

it from timing out and generating a device RESET.

The TO bit in the STATUS register will be cleared upon

a Watchdog Timer time-out.

10.7.2

WDT PROGRAMMING CONSIDERATIONS

MOVWF

SWAPF

STATUS

W_TEMP,F

W_TEMP,W

It should also be taken in account that under worst case

conditions (V

= Min., Temperature = Max., max.

WDT prescaler) it may take several seconds before a

WDT time-out occurs.

漏

1998 Microchip Technology Inc.

Preliminary

DS40182A-page 61

prev next

PIC16CE625相关型号PDF文件下载

型号

版本

描述

厂商

下载
PIC12

英文版

8-Pin FLASH-Based 8-Bit CMOS Microcontrollers

PIC12
PIC12

英文版

8-Pin, 8-Bit CMOS Microcontroller with EEPROM Data Memory

MICROCHIP ...

PIC12
PIC12

英文版

8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEP...

MICROCHIP ...

PIC12
PIC12

英文版

8-Pin, 8-Bit CMOS Microcontrollers

MICROCHIP ...

PIC12
PIC12

英文版

EPROM Memory Programming Specification

MICROCHIP ...

PIC12
PIC12

英文版

8-Pin FLASH-Based 8-Bit CMOS Microcontrollers

MICROCHIP ...

PIC12
PIC18

英文版

Microcontroller

PIC18
PIC10F

英文版

Microcontroller

PIC10F
PIC1657

英文版

Microcontroller

ETC

PIC1657
PIC16C5

英文版

EPROM-Based 8-Bit CMOS Microcontroller

PIC16C5
PIC12C50

英文版

8-Pin, 8-Bit CMOS Microcontrollers

PIC12C50
PIC12C50

英文版

8-Pin, 8-Bit CMOS Microcontrollers

MICROCHIP ...

PIC12C50
PIC12C5X

英文版

ETC

PIC12C5X
PIC12C67

英文版

EPROM Memory Programming Specification

PIC12C67
PIC12C67

英文版

EPROM Memory Programming Specification

MICROCHIP ...

PIC12C67
PIC14000

英文版

28-Pin Programmable Mixed Signal Controller

PIC14000
PIC14000

英文版

EPROM Memory Programming Specification

PIC14000
PIC1657I

英文版

Microcontroller

ETC

PIC1657I
PIC1657M

英文版

Microcontroller

ETC

PIC1657M
PIC16C52

英文版

EPROM/ROM-Based 8-Bit CMOS Microcontroller Series

PIC16C52

PIC16CE625 Datasheet

PDF预览

PIC16CE625相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

PIC16CE625 Datasheet

PDF预览

PIC16CE625相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

建议反馈

PDF纠错X