参数资料
型号: PIC14000T-20/SS
厂商: Microchip Technology
文件页数: 89/153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 40
Preliminary
1996 Microchip Technology Inc.
6.3.1
SWITCHING PRESCALER ASSIGNMENT
The prescaler assignment is fully under software
control, i.e., it can be changed “on the y” during
program execution. To avoid an unintended device
RESET,
the
following
instruction
sequence
(Example 6-1) must be executed when changing the
prescaler assignment from Timer0 to WDT.
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
→WDT)
1.BCF
STATUS,RP0
;Skip if already in
; Bank 0
2.CLRWDT
;Clear WDT
3.CLRF
TMR0
;Clear TMR0 & Prescaler
4.BSF
STATUS, RP0 ;Bank 1
5.MOVLW '00101111'b;These 3 lines (5, 6, 7)
6.MOVWF OPTION
; are required only
; if desired PS<2:0>
7.CLRWDT
; are 000 or 001
8.MOVLW '00101xxx'b ;Set Postscaler to
9.MOVWF OPTION
; desired WDT rate
10.BCF
STATUS, RP0 ;Return to Bank 0
To change prescaler from the WDT to the Timer0
module use the sequence shown in Example 6-2. This
precaution must be taken even if the WDT is disabled.
EXAMPLE 6-2:
CHANGING PRESCALER
(WDT
→TIMER0)
CLRWDT
;Clear WDT and
;prescaler
BSF
STATUS, RP0
MOVLW
B'xxxx0xxx'
;Select TMR0, new
;prescale value and
;clock source
MOVWF
OPTION
BCF
STATUS, RP0
TABLE 6-1:
SUMMARY OF TIMER0 REGISTERS
TABLE 6-2:
REGISTERS ASSOCIATED WITH TIMER0
Register Name
Function
Address
Power-on Reset Value
TMR0
Timer/counter register
01h
xxxx xxxx
OPTION
Conguration and prescaler assign-
ment bits for TMR0.
81h
1111 1111
INTCON
TMR0 overow interrupt ag and
mask bits.
0Bh
0000 000x
Legend: x = unknown,
Note 1: For reset values of registers in other reset situations refer to Table 10-4.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
01h
TMR0
TIMER0 TIMER/COUNTER
0Bh/8Bh
INTCON
GIE
PEIE
T0IE
r
T0IF
r
81h
OPTION
RCPU
r
T0CS
T0SE
PSA
PS2
PS1
PS0
87h
TRISC
TRISC7
TRISC6
TRISC5
TRISC4
TRISC3
TRISC2
TRISC1
TRISC0
Legend: r = Reserved locations
Shaded boxes are not used by Timer0 module
相关PDF资料
PDF描述
MT5600SMI-X-L-34.R2 MODEM V.34 SERIAL DATA/FAX 3.3V
VE-22V-IY-S CONVERTER MOD DC/DC 5.8V 50W
VE-22T-IY-S CONVERTER MOD DC/DC 6.5V 50W
PIC14000T-20/SO IC MCU OTP 4KX14 A/D 28SOIC
MT100SEM-L.R1-SP DEVICE SERVER EMBEDDED 3.3V
相关代理商/技术参数
参数描述
PIC-1503 制造商:KODENSHI 制造商全称:KODENSHI KOREA CORP. 功能描述:Photo IC(photodiode with signal processing)
PIC152N-A 制造商:SELEC CONTROLS 功能描述:PROCESS INDICATOR,2 ALARMS,1/8DIN,4DIGIT,RELAY OUTPUT
PIC152N-B-2 制造商:SELEC CONTROLS 功能描述:PROCESS INDICATOR,2 ALARMS,RETRANSMISSION OUTPUT
PIC163F73-I/SP 制造商:Microchip Technology Inc 功能描述:8BIT RISC - Bulk
PIC1655A-278 制造商:GI 功能描述: