參數(shù)資料
型號: PIC12CE674/JW
廠商: Microchip Technology
文件頁數(shù): 67/129頁
文件大?。?/td> 0K
描述: IC MCU EPROM 2KX14 A/D&EE 8CDIP
標準包裝: 56
系列: PIC® 12C
核心處理器: PIC
芯體尺寸: 8-位
速度: 10MHz
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 5
程序存儲器容量: 3.5KB(2K x 14)
程序存儲器類型: EPROM,UV
EEPROM 大小: 16 x 8
RAM 容量: 128 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 4x8b
振蕩器型: 內(nèi)部
工作溫度: 0°C ~ 70°C
封裝/外殼: 8-CDIP(0.300",7.62mm)窗口
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC
PIC12C67X
DS30561B-page 42
1999 Microchip Technology Inc.
7.3
Prescaler
An 8-bit counter is available as a prescaler for the
Timer0 module, or as a postscaler for the Watchdog
Timer, respectively (Figure 7-6). For simplicity, this
counter is being referred to as “prescaler” throughout
this data sheet. Note that there is only one prescaler
available which is mutually exclusively shared between
the Timer0 module and the Watchdog Timer. Thus, a
prescaler assignment for the Timer0 module means
that there is no prescaler for the Watchdog Timer, and
vice-versa.
The PSA and PS<2:0> bits (OPTION<3:0>) determine
the prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (i.e., 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 Watchdog Timer. The pres-
caler is not readable or writable.
FIGURE 7-6:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
GP2/T0CKI/
T0SE
AN2/INT
M
U
X
CLKOUT (= FOSC/4)
SYNC
2
Cycles
TMR0 reg
8-bit Prescaler
8 - to - 1MUX
M
U
X
M U X
Watchdog
Timer
PSA
0
1
0
1
WDT
Time-out
PS<2:0>
8
Note: T0CS, T0SE, PSA, PS<2:0> are (OPTION<5:0>).
PSA
WDT Enable bit
M
U
X
0
1
0
1
Data Bus
Set flag bit T0IF
on Overflow
8
PSA
T0CS
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