參數資料
| 型號： | AT90LS2343-1PC |
| 廠商： | Atmel |
| 文件頁數： | 53/63頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 2K FLASH 1MHZ COM 8-DIP |
| 標準包裝： | 50 |
| 系列： | AVR® 90LS |
| 核心處理器： | AVR |
| 芯體尺寸： | 8-位 |
| 速度： | 1MHz |
| 連通性： | SPI |
| 外圍設備： | 欠壓檢測/復位，POR，WDT |
| 輸入/輸出數： | 5 |
| 程序存儲器容量： | 2KB（1K x 16） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 128 x 8 |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 6 V |
| 振蕩器型： | 內部 |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
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PIC16C433
DS41139B-page 56
Preliminary
2002 Microchip Technology Inc.
9.4
Power-on Reset (POR), Power-up
Timer (PWRT) and Oscillator Start-up
Timer (OST)
9.4.1
POWER-ON RESET (POR)
The on-chip POR circuit holds the chip in RESET until
VDD has reached a high enough level for proper oper-
ation. To take advantage of the POR, just tie the MCLR
pin through a resistor to VDD. This will eliminate exter-
nal 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, ...) must be met to ensure
operation. If these conditions are not met, the device
must be held in RESET until the operating conditions
are met.
For additional information, refer to Application Note
AN607, "Power-up Trouble Shooting."
9.4.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms nominal
timeout 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 accept-
able level. A configuration bit is provided to enable/dis-
able the PWRT.
The power-up time delay will vary from chip to chip due
to VDD, temperature and process variation.
9.4.3
OSCILLATOR START-UP TIMER (OST)
The Oscillator Start-up Timer (OST) provides 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal oscil-
lator, or resonator has started and stabilized.
The OST timeout is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
9.4.4
TIMEOUT SEQUENCE
On power-up, the timeout Sequence is as follows: first,
PWRT timeout is invoked after the POR time delay has
expired; then, OST is activated. The total timeout 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 timeout at all. Figure 9-7,
Figure 9-8, and Figure 9-9 depict timeout sequences
on power-up.
Since the timeouts occur from the POR pulse, if MCLR
is kept low long enough, the timeouts will expire. Then
bringing MCLR high will begin execution immediately
(Figure 9-9). This is useful for testing purposes, or to
synchronize more than one PIC16C433 device operat-
ing in parallel.
9.4.5
POWER CONTROL/STATUS REGISTER
(PCON)
The Power Control/Status Register, PCON (address
8Eh), has one bit.
Bit1 is POR (Power-on Reset). It is cleared on a Power-
on Reset and is unaffected otherwise. The user sets
this bit following a Power-on Reset. On subsequent
RESETS, if POR is ‘0’, it will indicate that a Power-on
Reset must have occurred.
TABLE 9-4:
TIMEOUT IN VARIOUS SITUATIONS
TABLE 9-5:
STATUS/PCON BITS AND THEIR SIGNIFICANCE
Legend: u = unchanged, x = unknown
Oscillator Configuration
Power-up
Wake-up from SLEEP
PWRTE = 0
PWRTE = 1
XT, HS, LP
72 ms + 1024TOSC
1024TOSC
INTRC, EXTRC
72 ms
—
POR
TO
PD
01
1
Power-on Reset
00
x
Illegal, TO is set on POR
0x
0
Illegal, PD is set on POR
10
u
WDT Reset
10
0
WDT Wake-up
1u
u
MCLR Reset during normal operation
11
0
MCLR Reset during SLEEP or interrupt Wake-up from SLEEP
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相關代理商/技術參數 |
參數描述 |
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| AT90LS2343-1PI | 功能描述:IC MCU 2K FLASH 1MHZ IND 8-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AVR® 90LS 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設備:POR，WDT 輸入/輸出數:32 程序存儲器容量:32KB（32K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:- 振蕩器型:內部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
| AT90LS2343-1SC | 功能描述:IC MCU 2K FLASH 1MHZ COM 8-SOIC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:AVR® 90LS 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設備:POR，WDT 輸入/輸出數:32 程序存儲器容量:32KB（32K x 8） 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:- 振蕩器型:內部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP（0.600"，15.24mm） 包裝:管件 |
| AT90LS2343-1SI | 功能描述:8位微控制器 -MCU 2k bit RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
| AT90LS2343-4PC | 功能描述:8位微控制器 -MCU 2k bit RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 |
| AT90LS2343-4PI | 功能描述:8位微控制器 -MCU 2k bit RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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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