參數(shù)資料
型號: PIC14000-04I/SP
廠商: Microchip Technology
文件頁數(shù): 85/153頁
文件大?。?/td> 0K
描述: IC MCU OTP 4KX14 A/D 28DIP
產(chǎn)品培訓模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標準包裝: 15
系列: PIC® 14
核心處理器: PIC
芯體尺寸: 8-位
速度: 4MHz
連通性: I²C
外圍設備: POR,溫度傳感器,WDT
輸入/輸出數(shù): 20
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: OTP
RAM 容量: 192 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器: 斜率 A/D
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
配用: ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
ICE2000-ND - EMULATOR MPLAB-ICE 2000 POD
1996 Microchip Technology Inc.
Preliminary
DS40122B-page 37
PIC14000
6.0
TIMER MODULES
The PIC14000 contains two general purpose timer
modules, Timer0 (TMR0) and the Watchdog Timer
(WDT). The ADTMR is described in the A/D section.
The Timer0 module is identical to the Timer0 module of
the PIC16C7X enhanced core products. It is an 8-bit
overow counter.
The Timer0 module has a programmable prescaler
option. This prescaler can be assigned to either the
Timer0 module or the Watchdog Timer (WDT). PSA
(OPTION<3>) assigns the prescaler, and PS2:PS0
(OPTION<2:0>)
determines
the
prescaler
value.
Timer0 can increment at the following rates: 1:1 (when
prescaler assigned to Watchdog Timer), 1:2, 1:4, 1:8,
1:16, 1:32, 1:64, 1:128, 1:256.
The Timer0 module has the following features:
8-bit timer
Readable and writable (le address 01h)
8-bit software programmable prescaler
Interrupt on overow from FFh to 00h
Figure 6-1 is a simplied block diagram of the Timer0
module.
The Timer0 module will increment every instruction
cycle (without prescaler). If TMR0 is written, increment
is inhibited for the following two cycles (Figure 6-2 and
Figure 6-3). The user can compensate by writing an
adjusted value to TMR0.
FIGURE 6-1:
TIMER0 AND WATCHDOG TIMER BLOCK DIAGRAM
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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