參數(shù)資料
型號: PIC16LF721-I/P
廠商: Microchip Technology
文件頁數(shù): 127/135頁
文件大?。?/td> 0K
描述: MCU PIC 4K FLASH 20-DIP
產(chǎn)品培訓(xùn)模塊: 8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 22
系列: PIC® XLP™ 16F
核心處理器: PIC
芯體尺寸: 8-位
速度: 16MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 17
程序存儲器容量: 7KB(4K x 14)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 12x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-DIP(0.300",7.62mm)
包裝: 管件
2010-2011 Microchip Technology Inc.
Preliminary
DS41430C-page 91
PIC16(L)F720/721
12.0 TIMER0 MODULE
The Timer0 module is an 8-bit timer/counter with the
following features:
8-bit timer/counter register (TMR0)
8-bit prescaler (shared with Watchdog Timer)
Programmable internal or external clock source
Programmable external clock edge selection
Interrupt on overflow
TMR0 can be used to gate Timer1
Figure 12-1 is a block diagram of the Timer0 module.
12.1
Timer0 Operation
The Timer0 module can be used as either an 8-bit timer
or an 8-bit counter.
12.1.1
8-BIT TIMER MODE
The Timer0 module will increment every instruction
cycle, if used without a prescaler. 8-Bit Timer mode is
selected by clearing the T0CS bit of the OPTION_REG
register.
When TMR0 is written, the increment is inhibited for
two instruction cycles immediately following the write.
12.1.2
8-BIT COUNTER MODE
In 8-Bit Counter mode, the Timer0 module will increment
on every rising or falling edge of the T0CKI pin.
8-Bit Counter mode using the T0CKI pin is selected by
setting the T0CS bit in the OPTION_REG register to ‘1’.
The rising or falling transition of the incrementing edge
for either input source is determined by the T0SE bit in
the OPTION_REG register.
FIGURE 12-1:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
Note:
The value written to the TMR0 register
can be adjusted, in order to account for
the two instruction cycle delay when
TMR0 is written.
T0CKI
T0SE
TMR0
WDT
Time-out
PS<2:0>
WDTEN
Data Bus
Set Flag bit T0IF
on Overflow
T0CS
0
1
0
1
0
1
8
8-bit
Prescaler
0
1
FOSC/4
PSA
SYNC
2 TCY
Overflow to Timer1
Divide by
512
TMR1GE
T1GSS = 11
Low-Power
WDT
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