參數(shù)資料
型號： PIC16CR74
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 49/172頁
文件大小： 1506K
代理商： PIC16CR74
2007 Microchip Technology Inc.
DS21993C-page 47
PIC16CR7X
6.0
TIMER1 MODULE
The Timer1 module is a 16-bit timer/counter consisting
of two 8-bit registers (TMR1H and TMR1L), which are
readable and writable. The TMR1 Register pair
(TMR1H:TMR1L) increments from 0000h to FFFFh
and rolls over to 0000h. The TMR1 Interrupt, if enabled,
is generated on overflow, which is latched in interrupt
flag bit TMR1IF (PIR1<0>). This interrupt can be
enabled/disabled by setting/clearing TMR1 interrupt
enable bit TMR1IE (PIE1<0>).
Timer1 can operate in one of two modes:
As a timer
As a counter
The operating mode is determined by the clock select
bit, TMR1CS (T1CON<1>).
In Timer mode, Timer1 increments every instruction
cycle. In Counter mode, it increments on every rising
edge of the external clock input.
Timer1 can be enabled/disabled by setting/clearing
control bit TMR1ON (T1CON<0>).
Timer1 also has an internal “Reset input”. This Reset
can be generated by either of the two CCP modules as
the special event trigger (see Sections 8.1 and 8.2).
Register 6-1 shows the Timer1 Control register.
When the Timer1 oscillator is enabled (T1OSCEN is
set), the RC1/T1OSI/CCP2 and RC0/T1OSO/T1CKI
pins become inputs. That is, the TRISC<1:0> value is
ignored and these pins read as ‘
0
’.
Additional information on timer modules is available in
the “
PIC
Mid-Range MCU Family Reference Manual
”
(DS33023).
REGISTER 6-1:
T1CON: TIMER1 CONTROL (ADDRESS 10h)
U-0
—
U-0
—
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
T1CKPS1
T1CKPS0
T1OSCEN
T1SYNC
TMR1CS
TMR1ON
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
bit 5-4
Unimplemented:
Read as ‘
0
’
T1CKPS1:T1CKPS0
: Timer1 Input Clock Prescale Select bits
11
= 1:8 Prescale value
10
= 1:4 Prescale value
01
= 1:2 Prescale value
00
= 1:1 Prescale value
T1OSCEN
: Timer1 Oscillator Enable Control bit
1
= Oscillator is enabled
0
= Oscillator is shut-off (the oscillator inverter is turned off to eliminate power drain)
T1SYNC
: Timer1 External Clock Input Synchronization Control bit
TMR1CS =
1
:
1
= Do not synchronize external clock input
0
= Synchronize external clock input
TMR1CS =
0
:
This bit is ignored. Timer1 uses the internal clock when TMR1CS =
0
.
TMR1CS
: Timer1 Clock Source Select bit
1
= External clock from pin RC0/T1OSO/T1CKI (on the rising edge)
0
= Internal clock (F
OSC
/4)
TMR1ON
: Timer1 On bit
1
= Enables Timer1
0
= Stops Timer1
bit 3
bit 2
bit 1
bit 0
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