參數(shù)資料
型號： PIC12LC508AT-04I/MF
廠商： Microchip Technology
文件頁數(shù)： 35/113頁
文件大?。?/td> 0K
描述： IC MCU OTP 512X12 LV 8-DFN
標(biāo)準(zhǔn)包裝： 3,300
系列： PIC® 12C
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 5
程序存儲器容量： 768B（512 x 12）
程序存儲器類型： OTP
RAM 容量： 25 x 8
電壓 - 電源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-VDFN 裸露焊盤
包裝： 帶卷 (TR)
其它名稱： PIC12LC508AT04IMF
PIC12C5XX
DS40139E-page 28
1999 Microchip Technology Inc.
6.2
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer (WDT), respectively (Section 8.6). For simplicity,
this counter is being referred to as “prescaler”
throughout this data sheet. Note that the prescaler
may be used by either the Timer0 module or the WDT,
but not both. Thus, a prescaler assignment for the
Timer0 module means that there is no prescaler for
the WDT, and vice-versa.
The
PSA
and
PS2:PS0
bits
(OPTION<3:0>)
determine prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing
to
the
TMR0
register
(e.g.,
CLRF 1,
MOVWF 1,
BSF 1,x,
etc.) will clear the prescaler.
When assigned to WDT, a CLRWDT instruction will
clear the prescaler along with the WDT. The prescaler
is neither readable nor writable. On a RESET, the
prescaler contains all '0's.
6.2.1
SWITCHING PRESCALER ASSIGNMENT
The prescaler assignment is fully under software control
(i.e., it can be changed “on the fly” 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 the WDT.
EXAMPLE 6-1:
CHANGING PRESCALER
(TIMER0
→WDT)
1.CLRWDT
;Clear WDT
2.CLRF
TMR0
;Clear TMR0 & Prescaler
3.MOVLW
'00xx1111’b ;These 3 lines (5, 6, 7)
4.OPTION
; are required only if
; desired
5.CLRWDT
;PS<2:0> are 000 or 001
6.MOVLW
'00xx1xxx’b ;Set Postscaler to
7.OPTION
; desired WDT rate
To change prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT
instruction
should
be
executed
before
switching the prescaler.
EXAMPLE 6-2:
CHANGING PRESCALER
(WDT
→TIMER0)
CLRWDT
;Clear WDT and
;prescaler
MOVLW
'xxxx0xxx'
;Select TMR0, new
;prescale value and
;clock source
OPTION
FIGURE 6-5:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
TCY ( = Fosc/4)
Sync
2
Cycles
TMR0 reg
8-bit Prescaler
8 - to - 1MUX
M
MUX
Watchdog
Timer
PSA
0
1
0
1
WDT
Time-Out
PS2:PS0
8
Note: T0CS, T0SE, PSA, PS2:PS0 are bits in the OPTION register.
PSA
WDT Enable bit
0
1
0
1
Data Bus
8
PSA
T0CS
M
U
X
M
U
X
U
X
T0SE
GP2/T0CKI
Pin
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC12LC508AT-04ISN 制造商:Microchip Technology Inc 功能描述:PIC12 Series 25 B RAM 512 x 12 Bit EPROM 8-Bit CMOS Microcontroller - SOIC-8
PIC12LC508AT-04ISN-CUT TAPE 制造商:Microchip 功能描述:PIC12 Series 25 B RAM 512 x 12 Bit EPROM 8-Bit CMOS Microcontroller - SOIC-8
PIC12LC509A-04/P 功能描述:8位微控制器 -MCU 1.5KB 41 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC12LC509A-04/SM 功能描述:8位微控制器 -MCU 1kx12 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC12LC509A-04/SN 功能描述:8位微控制器 -MCU 1kx12 OTP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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