參數(shù)資料
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算放大器
文件頁數(shù)： 110/178頁
文件大小： 1620K
代理商： PIC16F785
PIC16F785
DS41249A-page 108
Preliminary
2004 Microchip Technology Inc.
15.3.6
TIME-OUT SEQUENCE
On power-up, the time-out sequence is as follows: first,
PWRT time out is invoked after POR has expired, then
OST is activated after the PWRT time out has expired.
The total time out will vary based on oscillator configu-
ration and PWRTE bit status. For example, in EC mode
with PWRTE bit equal to ‘
1
’ (PWRT disabled), there will
be no time out at all. Figure 15-4, Figure 15-5 and
Figure 15-6 depict time-out sequences. The device can
execute code from the INTOSC, while OST is active by
enabling Two-Speed Start-up or Fail-Safe Monitor (See
Section 3.6.2 “Two-Speed Start-up Sequence”
and
Section 3.7 “Fail-Safe Clock Monitor”
).
Since the time outs occur from the POR pulse, if MCLR
is kept low long enough, the time outs will expire. Then
bringing MCLR high will begin execution immediately
(see Figure 15-5). This is useful for testing purposes or
to synchronize more than one PIC16F785 device
operating in parallel.
Table 15-5 shows the Reset conditions for some
special registers, while Table 15-4 shows the Reset
conditions for all the registers.
15.3.7
POWER CONTROL (PCON)
REGISTER
The Power Control register PCON (address 8Eh) has
two Status bits to indicate what type of Reset that last
occurred.
Bit 0 is BOR (Brown-out Reset). BOR is unknown on
Power-on Reset. It must then be set by the user and
checked on subsequent Resets to see if BOR =
0
,
indicating that a Brown-out has occurred. The BOR
Status bit is a “don’t care” and is not necessarily
predictable if the brown-out circuit is disabled
(BOREN<1:0> =
00
in the Configuration Word).
Bit 1 is POR (Power-on Reset). It is a ‘
0
’ on Power-on
Reset and unaffected otherwise. The user must write a
‘
1
’ to this bit following a Power-on Reset. On a
subsequent Reset, if POR is ‘
0
’, it will indicate that a
Power-on Reset has occurred (i.e., V
DD
may have
gone too low).
For more information, see
Section 15.3.4 “Brown-Out
Reset (BOR)”
.
TABLE 15-1:
TIME OUT IN VARIOUS SITUATIONS
TABLE 15-2:
STATUS/PCON BITS AND THEIR SIGNIFICANCE
TABLE 15-3:
SUMMARY OF REGISTERS ASSOCIATED WITH BROWN-OUT
Oscillator Configuration
Power-up
Brown-out Reset
Wake-up
from Sleep
PWRTE =
0
PWRTE =
1
PWRTE =
0
PWRTE =
1
XT, HS, LP
T
PWRT
+
1024T
OSC
1024T
OSC
T
PWRT
+
1024T
OSC
1024T
OSC
1024T
OSC
RC, EC, INTOSC
T
PWRT
—
T
PWRT
—
—
POR
BOR
TO
PD
Condition
0
x
1
1
Power-on Reset
1
0
1
1
Brown-out Reset
u
u
0
u
WDT Reset
u
u
0
0
WDT Wake-up
u
u
u
u
MCLR Reset during normal operation
u
u
1
0
MCLR Reset during Sleep
Legend:
u
= unchanged,
x
= unknown
Address
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
(1)
03h, 103h
83h, 183h
STATUS
IRP
RP1
RPO
TO
PD
Z
DC
C
0001 1xxx
000q quuu
8Eh
Legend:
PCON
u
= unchanged,
x
= unknown, — = unimplemented bit, reads as ‘
0
’,
q
= value depends on condition. Shaded cells are
not used by BOR.
Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
—
—
—
SBOREN
—
—
POR
BOR
---1 --qq
---u --uu
Note
1:
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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 安裝風格:SMD/SMT
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