參數(shù)資料
型號(hào): AT89C51RC2-RLRUM
廠商: Atmel
文件頁數(shù): 101/127頁
文件大?。?/td> 0K
描述: MCU 8051 32K FLASH 5V 44-VQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 1
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 32KB(32K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LQFP
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: AT89C51RC2-RLRUMDKR
75
AT89C51RB2/RC2
4180E–8051–10/06
Reset Value = 0001 0100b
Not bit addressable
Serial Peripheral Status Register
(SPSTA)
The Serial Peripheral Status Register contains flags to signal the following conditions:
Data transfer complete
Write collision
Inconsistent logic level on SS pin (mode fault error)
Table 57 describes the SPSTA register and explains the use of every bit in the register.
Table 57. SPSTA Register
SPSTA - Serial Peripheral Status and Control register (0C4H)
1
SPR1
SPR2
SPR1
SPR0 Serial Peripheral Rate
00
0
F
CLK PERIPH /2
00
1
F
CLK PERIPH /4
01
0
F
CLK PERIPH /8
01
1
F
CLK PERIPH /16
10
0
F
CLK PERIPH /32
10
1
F
CLK PERIPH /64
11
0
F
CLK PERIPH /128
1
Invalid
0
SPR0
Bit Number
Bit Mnemonic
Description
76
54
32
1
0
SPIF
WCOL
SSERR
MODF
-
Bit
Number
Bit
Mnemonic Description
7
SPIF
Serial Peripheral Data Transfer Flag
Cleared by hardware to indicate data transfer is in progress or has been
approved by a clearing sequence.
Set by hardware to indicate that the data transfer has been completed.
6WCOL
Write Collision Flag
Cleared by hardware to indicate that no collision has occurred or has been
approved by a clearing sequence.
Set by hardware to indicate that a collision has been detected.
5
SSERR
Synchronous Serial Slave Error Flag
Set by hardware when SS is deasserted before the end of a received data.
Cleared by disabling the SPI (clearing SPEN bit in SPCON).
4MODF
Mode Fault
Cleared by hardware to indicate that the SS pin is at appropriate logic level, or
has been approved by a clearing sequence.
Set by hardware to indicate that the SS pin is at inappropriate logic level.
3-
Reserved
The value read from this bit is indeterminate. Do not set this bit
2-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
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