参数资料
型号: AT89LP4052-16SU
厂商: Atmel
文件页数: 55/94页
文件大小: 0K
描述: IC 8051 MCU FLASH 4K 20SOIC
标准包装: 38
系列: 89LP
核心处理器: 8051
芯体尺寸: 8-位
速度: 16MHz
连通性: SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 15
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-SOIC(0.295",7.50mm 宽)
包装: 管件
59
3547J–MICRO–10/09
AT89LP2052/LP4052
23.2
Status Register
The current state of the memory may be accessed by reading the status register. The status reg-
ister is shown in Table 23-2.
23.3
DATA Polling
The AT89LP2052/LP4052 implements DATA polling to indicate the end of a programming cycle.
While the device is busy, any attempted read of the last byte written will return the data byte with
the MSB complemented. Once the programming cycle has completed, the true value will be
accessible. During Erase the data is assumed to be FFH and DATA polling will return 7FH.
When writing multiple bytes in a page, the DATA value will be the last data byte loaded before
programming begins, not the written byte with the highest physical address within the page.
23.4
Parallel Programming
Parallel Programming Mode is enabled by applying V
PP to the RST pin. The connections
required during parallel mode are shown in Figure 23-2. During parallel programming, Port 1 is
configured as an 8-bit wide bidirectional command bus. Data on P1 is strobed by a positive
pulse on the XTAL1 pin. No other clock is required. The interface is enabled by pulling CS (P3.2)
low. P3.1 acts as RDY/BSY, and will be pulled low to indicate that the device is busy regardless
of the state of CS.
Table 23-2.
Status
Register
–––
LOAD
SUCCESS
WRTINH
BUSY
Bit
7
6
543
21
0
Symbol
Function
LOAD
Load flag. Cleared low by the load page buffer command and set high by the next memory write. This flag signals that
the page buffer was previously loaded with data by the load page buffer command.
SUCCESS
Success flag. Cleared low at the start of a programming cycle and will only be set high if the programming cycle
completes without interruption from the brownout detector.
WRTINH
Write Inhibit flag. Cleared low by the brownout detector (BOD) whenever programming is inhibited due to V
CC falling
below the minimum required programming voltage. If a BOD episode occurs during programming, the SUCCESS flag
will remain low after the cycle is complete. WRTINH low also forces BUSY low.
BUSY
Busy flag. Cleared low whenever the memory is busy programming or if write is currently inhibited.
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