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| 型號： | PIC16F785 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 20-Pin Flash-Based 8-Bit CMOS Microcontroller with Two-Phase Asychronous Feedback PWM, Dual High-Speed Comparators and Dual Operational Amplifiers |
| 中文描述： | 20引腳基于閃存的8兩相異步反饋的PWM，雙高位CMOS微控制器的高速比較器和雙運(yùn)算放大器 |
| 文件頁數(shù)： | 54/178頁 |
| 文件大小： | 1620K |
| 代理商： | PIC16F785 |
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PIC16F785
DS41249A-page 52
Preliminary
2004 Microchip Technology Inc.
6.5
Timer1 Operation in
Asynchronous Counter Mode
If control bit T1SYNC (T1CON<2>) is set, the external
clock input is not synchronized. The timer continues to
increment asynchronous to the internal phase clocks.
The timer will continue to run during Sleep and can
generate an interrupt on overflow, which will wake-up
the processor. However, special precautions in
software are needed to read/write the timer
(
Section 6.5.1 “Reading and Writing Timer1 in
Asynchronous Counter Mode”
).
6.5.1
READING AND WRITING TIMER1 IN
ASYNCHRONOUS COUNTER
MODE
Reading TMR1H or TMR1L while the timer is running
from an external asynchronous clock will ensure a valid
read (taken care of in hardware). However, the user
should keep in mind that reading the 16-bit timer in two
8-bit values itself, poses certain problems, since the
timer may overflow between the reads.
For writes, it is recommended that the user simply stop
the timer and write the desired values. A write conten-
tion may occur by writing to the timer registers, while
the register is incrementing. This may produce an
unpredictable value in the timer register.
Reading the 16-bit value requires some care.
Examples in the PICmicro
Mid-Range MCU Family
Reference Manual (DS33023) show how to read and
write Timer1 when it is running in Asynchronous mode.
6.6
Timer1 Oscillator
A crystal oscillator circuit is built-in between pins OSC1
(input) and OSC2 (amplifier output). It is enabled by
setting control bit T1OSCEN (T1CON<3>). The
oscillator is a low power oscillator rated for 32.768 kHz.
It will continue to run during Sleep. It is primarily
intended for a 32.768 kHz tuning fork crystal.
The Timer1 oscillator is shared with the system LP
oscillator. Thus, Timer1 can use this mode only when
the primary system clock is also the LP oscillator or is
derived from the internal oscillator. As with the system
LP oscillator, the user must provide a software time
delay to ensure proper oscillator start-up.
SLEEP mode will not disable the system clock when
the system clock and Timer1 share the LP oscillator.
TRISA<5> and TRISA<4> bits are set when the Timer1
oscillator is enabled. RA5 and RA4 read as ‘
0
’ and
TRISA<5> and TRISA<4> bits read as ‘
1
’.
6.7
Timer1 Operation During Sleep
Timer1 can only operate during Sleep when setup in
Asynchronous Counter mode. In this mode, an external
crystal or clock source can be used to increment the
counter. To setup the timer to wake the device:
Timer1 must be on (T1CON<0>)
TMR1IE bit (PIE1<0>) must be set
PEIE bit (INTCON<6>) must be set
The device will wake-up on an overflow. If the GIE bit
(INTCON<7>) is set, the device will wake-up and jump
to the Interrupt Service Routine (0004h) on an overflow.
If the GIE bit is clear, execution will continue with the
next instruction.
TABLE 6-1:
REGISTERS ASSOCIATED WITH TIMER1
Note:
The ANSEL0 (91h) register must be initial-
ized to configure an analog channel as a
digital input. Pins configured as analog
inputs will read ‘
0
’.
Note:
The oscillator requires a start-up and
stabilization time before use. Thus,
T1OSCEN should be set and a suitable
delay observed prior to enabling Timer 1.
Addr
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR, BOR
Value on
all other
Resets
0Bh,
8Bh
INTCON
GIE
PEIE
T0IE
INTE
RAIE
T0IF
INTF
RAIF
0000 0000
0000 0000
0Ch
PIR1
EEIF
ADIF
CCP1IF
C2IF
C1IF
OSFIF
TMR2IF
TMR1IF
0000 0000
0000 0000
0Eh
TMR1L
Holding register for the Least Significant Byte of the 16-bit TMR1 register
xxxx xxxx
uuuu uuuu
0Fh
TMR1H
Holding register for the Most Significant Byte of the 16-bit TMR1 register
xxxx xxxx
uuuu uuuu
10h
T1CON
T1GINV
TMR1GE
T1CKPS1
T1CKPS0
T1OSCEN
T1SYNC
TMR1CS
TMR1ON
0000 0000
uuuu uuuu
1Ah
CM2CON1 MC1OUT MC2OUT
—
—
—
—
T1GSS
C2SYNC
00-- --10
00-- --10
8Ch
PIE1
EEIE
ADIE
CCP1IE
C2IE
C1IE
OSFIE
TMR2IE
TMR1IE
0000 0000
0000 0000
91h
ANSEL0
ANS7
ANS6
ANS5
ANS4
ANS3
ANS2
ANS1
ANS0
1111 1111
1111 1111
Legend:
x
= unknown,
u
= unchanged, — = unimplemented, read as '
0
'. Shaded cells are not used by the Timer1 module.
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|---|---|
| PIC16F785-E/ML | 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16F785-E/P | 功能描述:8位微控制器 -MCU 14KB 368 RAM 33 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16F785-E/SO | 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16F785-E/SS | 功能描述:8位微控制器 -MCU 3.5KB FL 128R 18 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC16F785-I/ML | 功能描述:8位微控制器 -MCU 3.5 KB 128 RAM 18I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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