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參數(shù)資料
| 型號： | PIC16C925/L |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 7/183頁 |
| 文件大小： | 3233K |
| 代理商： | PIC16C925/L |
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PIC16C925/926
DS39544A-page 102
Preliminary
2001 Microchip Technology Inc.
12.4
Power-on Reset (POR),
Power-up Timer (PWRT),
Brown-out Reset (BOR) and
Oscillator Start-up Timer (OST)
12.4.1
POWER-ON RESET (POR)
A Power-on Reset pulse is generated on-chip when
VDD rise is detected (in the range of 1.5V - 2.1V). To
take advantage of the POR, just tie the MCLR pin
directly (or through a resistor) to VDD. This will elimi-
nate external RC components usually needed to create
a Power-on Reset. A maximum rise time for VDD is
specified. See Electrical Specifications for details.
When the device starts normal operation (exits the
RESET condition), device operating parameters (volt-
age, frequency, temperature, etc.) must be met to
ensure operation. If these conditions are not met, the
device must be held in RESET until the operating con-
ditions are met.
For additional information, refer to Application Note
AN607, “Power-up Trouble Shooting.”
12.4.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms nominal
time-out on power-up only, from the POR. The
Power-up Timer operates on an internal RC oscillator.
The chip is kept in RESET as long as the PWRT is
active. The PWRT’s time delay allows VDD to rise to an
acceptable level. A configuration bit is provided to
enable/disable the PWRT.
The power-up time delay will vary from chip to chip due
to VDD, temperature, and process variation. See DC
parameters for details.
12.4.3
OSCILLATOR START-UP TIMER
(OST)
The Oscillator Start-up Timer (OST), if enabled, pro-
vides 1024 oscillator cycle (from OSC1 input) delay
after the PWRT delay (if the PWRT is enabled). This
helps to ensure that the crystal oscillator or resonator
has started and stabilized.
The OST time-out is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
12.4.4
BROWN-OUT RESET (BOR)
The configuration bit, BOREN, can enable or disable
the Brown-out Reset circuit. If VDD falls below VBOR
(parameter D005, about 4V) for longer than TBOR
(parameter #35, about 100
S), the brown-out situation
will reset the device. If VDD falls below VBOR for less
than TBOR, a RESET may not occur.
Once the brown-out occurs, the device will remain in
Brown-out Reset until VDD rises above VBOR. The
Power-up Timer, if enabled, then keeps the device in
RESET for TPWRT (parameter #33, about 72mS). If
VDD should fall below VBOR during TPWRT, the
Brown-out Reset process will restart when VDD rises
above VBOR with the Power-up Timer Reset. The
Power-up Timer is enabled separately from Brown-out
Reset.
12.4.5
TIME-OUT SEQUENCE
On power-up, the time-out sequence is as follows:
First, PWRT time-out is invoked after the POR time
delay has expired. Then, OST is activated. The total
time-out will vary based on oscillator configuration and
the status of the PWRT. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
and
depict
time-out sequences on power-up.
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
(Figure 12-8). This is useful for testing purposes or to
synchronize more than one PIC16CXXX device oper-
ating in parallel.
Table 12-5 shows the RESET conditions for some spe-
cial function registers, while Table 12-6 shows the
RESET conditions for all the registers.
12.4.6
POWER CONTROL/STATUS
REGISTER (PCON)
The Power Control/Status Register, PCON, has up to
two bits depending upon the device.
Bit0 is Brown-out Reset Status bit, BOR. Bit BOR is
unknown on a Power-on Reset. It must then be set by
the user and checked on subsequent RESETS to see if
bit BOR cleared, indicating a BOR occurred. When the
Brown-out Reset is disabled, the state of the BOR bit is
unpredictable and is, therefore, not valid at any time.
Bit1 is Power-on Reset Status bit POR. It is cleared on
a Power-on Reset and unaffected otherwise. The user
must set this bit following a Power-on Reset.
TABLE 12-3:
TIME-OUT IN VARIOUS SITUATIONS
Oscillator Configuration
Power-up
Wake-up from SLEEP
PWRTE = 1
PWRTE = 0
XT, HS, LP
1024TOSC
72 ms + 1024TOSC
1024 TOSC
RC
—
72 ms
—
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| PIC16C925T-I/L | 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| PIC16C925T-I/PT | 功能描述:8位微控制器 -MCU 7KB 176 RAM 52 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| PIC16C926/CL | 功能描述:8位微控制器 -MCU 14KB 336 RAM 52 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| PIC16C926-I/L | 功能描述:8位微控制器 -MCU 14KB 336 RAM 52 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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 |
| PIC16C926-I/L | 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C926 PLCC68 |
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