參數(shù)資料
型號: AT89LP4052-16XU
廠商: Atmel
文件頁數(shù): 43/94頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 4K 20TSSOP
標(biāo)準(zhǔn)包裝: 74
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 16MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 15
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-TSSOP(0.173",4.40mm 寬)
包裝: 管件
48
3547J–MICRO–10/09
AT89LP2052/LP4052
Figure 19-4. SPI Transfer Format with CPHA = 0
Note:
*Not defined but normally MSB of character just received
Figure 19-5. SPI Transfer Format with CPHA = 1
Note:
*Not defined but normally LSB of previously transmitted character
19.4
SPI Pin Configuration
Before using the Serial Peripheral Interface the four SPI pins – SCK, MISO, MOSI and SS –
must be properly configured for the desired functionality. See Section 15.7 “Port Alternate Func-
tions” on page 23. When the SPI is in Master mode, SCK and MOSI must be configured as
bidirectional or output, with P1.7 and P1.5 set to “1”. MISO should be input-only, or bidirectional
with P1.6 set to “1”. When the SPI is in Slave mode, SCK, MOSI and SS must be configured as
input-only, or as bidirectional with P1.7, P1.6 and P1.4 set to “1”. MISO should be set as bidirec-
tional or output, with P1.6 set to “1”. If all four pins are set as bidirectional and their respectively
port bits are all “1”, it is possible to switch between Master and Slave mode without reconfiguring
the pins.
MSB
6
5
4
3
2
1
LSB
1
2
3
4
5
6
7
8
MSB
*
65
4
3
2
1
LSB
SCK CYCLE #
(FOR REFERENCE)
SCK (CPOL = 0)
SCK (CPOL = 1)
MOSI
(FROM MASTER)
MISO
(FROM SLAVE)
SS (TO SLAVE)
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