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參數(shù)資料
| 型號(hào)： | 16F630 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 14-Pin FLASH-Based 8-Bit CMOS Microcontrollers |
| 中文描述： | 14引腳基于閃存的8位CMOS微控制器 |
| 文件頁(yè)數(shù)： | 31/132頁(yè) |
| 文件大?。?/td> | 2651K |
| 代理商： | 16F630 |
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2003 Microchip Technology Inc.
DS40039C-page 29
PIC16F630/676
4.0
TIMER0 MODULE
The Timer0 module timer/counter has the following
features:
8-bit timer/counter
Readable and writable
8-bit software programmable prescaler
Internal or external clock select
Interrupt on overflow from FFh to 00h
Edge select for external clock
Figure 4-1 is a block diagram of the Timer0 module and
the prescaler shared with the WDT.
4.1
Timer0 Operation
Timer mode is selected by clearing the T0CS bit
(OPTION_REG<5>). In Timer mode, the Timer0
module will increment every instruction cycle (without
prescaler). If TMR0 is written, the increment is inhibited
for the following two instruction cycles. The user can
work around this by writing an adjusted value to the
TMR0 register.
Counter mode is selected by setting the T0CS bit
(OPTION_REG<5>). In this mode, the Timer0 module
will increment either on every rising or falling edge of
pin RA2/T0CKI. The incrementing edge is determined
by
the
source
edge
(OPTION_REG<4>). Clearing the T0SE bit selects the
rising edge.
(T0SE)
control
bit
4.2
Timer0 Interrupt
A Timer0 interrupt is generated when the TMR0
register timer/counter overflows from FFh to 00h. This
overflow sets the T0IF bit. The interrupt can be masked
by clearing the T0IE bit (INTCON<5>). The T0IF bit
(INTCON<2>) must be cleared in software by the
Timer0 module Interrupt Service Routine before re-
enabling this interrupt. The Timer0 interrupt cannot
wake the processor from SLEEP since the timer is
shut-off during SLEEP.
FIGURE 4-1:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
Note:
Additional information on the Timer0
module is available in the PICmicro
TM
Mid-
Range Reference Manual, (DS33023).
Note:
Counter mode has specific external clock
requirements. Additional information on
these requirements is available in the
PICmicro
TM
Mid-Range
Manual, (DS33023).
Reference
T0CKI
pin
T0SE
CLKOUT
(= F
OSC
/4)
TMR0
Watchdog
Timer
WDT
Time-out
PS0 - PS2
WDTE
Data Bus
Set Flag bit T0IF
on Overflow
T0CS
Note
1:
T0SE, T0CS, PSA, PS0-PS2 are bits in the Option register.
0
1
0
1
0
1
SYNC 2
Cycles
8
8
8-bit
Prescaler
0
1
PSA
PSA
PSA
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