參數(shù)資料
型號(hào): AT89LP3240-20MU
廠商: Atmel
文件頁(yè)數(shù): 190/200頁(yè)
文件大?。?/td> 0K
描述: MCU 8051 32K FLASH 20MHZ 7X7MLF
標(biāo)準(zhǔn)包裝: 360
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 38
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 8K x 8
RAM 容量: 4.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-VFQFN 裸露焊盤
包裝: 托盤
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9
3706C–MICRO–2/11
AT89LP3240/6440
2.3
Comparison to Standard 8051
The AT89LP3240/6440 is part of a family of devices with enhanced features that are fully binary
compatible with the 8051 instruction set. In addition, most SFR addresses, bit assignments, and
pin alternate functions are identical to Atmel's existing standard 8051 products. However, due to
the high performance nature of the device, some system behaviors are different from those of
Atmel's standard 8051 products such as AT89S52 or AT89C2051. The major differences from
the standard 8051 are outlined in the following paragraphs and may be useful to users migrating
to the AT89LP3240/6440 from older devices.
2.3.1
System Clock
The maximum CPU clock frequency equals the externally supplied XTAL1 frequency. The oscil-
lator is not divided by 2 to provide the internal clock and X2 mode is not supported. The System
Clock Divider can scale the CPU clock versus the oscillator source (See Section 6.5 on page
32).
2.3.2
Reset
The RST pin of the AT89LP3240/6440 is active-LOW as compared with the active-high reset in
the standard 8051. In addition, the RST pin is sampled every clock cycle and must be held low
for a minimum of two clock cycles, instead of 24 clock cycles, to be recognized as a valid reset.
2.3.3
Instruction Execution with Single-cycle Fetch
The CPU fetches one code byte from memory every clock cycle instead of every six clock
cycles. This greatly increases the throughput of the CPU. As a consequence, the CPU no longer
executes instructions in 12, 24 or 48 clock cycles. Each standard instruction executes in only 1
to 4 clock cycles. See “Instruction Set Summary” on page 143 for more details. Any software
delay loops or instruction-based timing operations may need to be retuned to achieve the
desired results.
2.3.4
Interrupt Handling
The interrupt controller polls the interrupt flags during the last clock cycle of any instruction. In
order for an interrupt to be serviced at the end of an instruction, its flag needs to have been
latched as active during the next to last clock cycle of the instruction, or in the last clock cycle of
the previous instruction if the current instruction executes in only a single clock cycle.
The external interrupt pins, INT0 and INT1, are sampled at every clock cycle instead of once
every 12 clock cycles. Coupled with the shorter instruction timing and faster interrupt response,
this leads to a higher maximum rate of incidence for the external interrupts.
The Serial Peripheral Interface (SPI) has a dedicated interrupt vector. The SPI no longer shares
its interrupt with the Serial Port and the ESPI (IE2.2) bit replaces SPIE (SPCR.7).
2.3.5
Timer/Counters
By default Timer0, Timer 1 and Timer 2 are incremented at a rate of once per clock cycle. This
compares to once every 12 clocks in the standard 8051. A common prescaler is available to
divide the time base for all timers and reduce the increment rate. The TPS
3-0 bits in the CLKREG
SFR control the prescaler (Table 6-2 on page 33). Setting TPS
3-0 = 1011B will cause the timers
to count once every 12 clocks.
The external Timer/Counter pins, T0, T1, T2 and T2EX, are sampled at every clock cycle instead
of once every 12 clock cycles. This increases the maximum rate at which the Counter modules
may function.
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