參數(shù)資料
型號(hào)： AT89S8252-24PC
廠商： Atmel
文件頁(yè)數(shù)： 15/41頁(yè)
文件大小： 0K
描述： MCU W/SPI 8KB FLSH 2K EEP 40-DIP
標(biāo)準(zhǔn)包裝： 9
系列： 89S
核心處理器： 8051
芯體尺寸： 8-位
速度： 24MHz
連通性： SPI，UART/USART
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 8KB（8K x 8）
程序存儲(chǔ)器類型： 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量： 256 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
其它名稱： AT89S825224PC
22
AT89S8252
0401G–MICRO–3/06
Idle Mode
In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active.
The mode is invoked by software. The content of the on-chip RAM and all the special
functions registers remain unchanged during this mode. The idle mode can be termi-
nated by any enabled interrupt or by a hardware reset.
Note that when idle mode is terminated by a hardware reset, the device normally
resumes program execution from where it left off, up to two machine cycles before the
internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM
in this event, but access to the port pins is not inhibited. To eliminate the possibility of an
unexpected write to a port pin when idle mode is terminated by a reset, the instruction
following the one that invokes idle mode should not write to a port pin or to external
memory.
Power-down Mode
In the power-down mode, the oscillator is stopped and the instruction that invokes
power-down is the last instruction executed. The on-chip RAM and Special Function
Registers retain their values until the power-down mode is terminated. Exit from power-
down can be initiated either by a hardware reset or by an enabled external interrupt.
Reset redefines the SFRs but does not change the on-chip RAM. The reset should not
be activated before V
CC is restored to its normal operating level and must be held active
long enough to allow the oscillator to restart and stabilize.
To exit power-down via an interrupt, the external interrupt must be enabled as level sen-
sitive before entering power-down. The interrupt service routine starts at 16 ms
(nominal) after the enabled interrupt pin is activated.
Program Memory
Lock Bits
The AT89S8252 has three lock bits that can be left unprogrammed (U) or can be pro-
grammed (P) to obtain the additional features listed in the following table.
When lock bit 1 is programmed, the logic level at the EA pin is sampled and latched dur-
ing reset. If the device is powered up without a reset, the latch initializes to a random
value and holds that value until reset is activated. The latched value of EA must agree
with the current logic level at that pin in order for the device to function properly.
Once programmed, the lock bits can only be unprogrammed with the Chip Erase opera-
tions in either the parallel or serial modes.
Notes:
1. U = Unprogrammed
2. P = Programmed
Status of External Pins During Idle and Power-down Modes
Mode
Program
Memory
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
Data
Idle
External
1
Float
Data
Address
Data
Power-down
Internal
0
Data
Power-down
External
0
Float
Data
Lock Bit Protection Modes(1)(2)
Program Lock Bits
Protection Type
LB1
LB2
LB3
1
U
No internal memory lock feature.
2
P
U
MOVC instructions executed from external program memory are disabled from fetching code bytes from
internal memory. EA is sampled and latched on reset and further programming of the Flash memory
(parallel or serial mode) is disabled.
3
P
U
Same as Mode 2, but parallel or serial verify are also disabled.
4
P
Same as Mode 3, but external execution is also disabled.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89S8252-24PI 功能描述:8位微控制器 -MCU w/8k 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
AT89S8252-24QC 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S8252-W 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S8253-24AC 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S8253-24AI 功能描述:8位微控制器 -MCU UNSAWN WAFER 20 MIL BACKGRIND - 24MHZ 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
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