參數資料
型號: AT89C51ID2-RLTUM
廠商: Atmel
文件頁數: 142/157頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 64K 44VQFP
產品培訓模塊: MCU Product Line Introduction
標準包裝: 800
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: I²C,SPI,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數: 34
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 2K 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: 托盤
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
85
AT89C51ID2
4289C–8051–11/05
its own slave address followed by the data direction bit which must be at logic 1 (R) for
TWI to operate in the slave transmitter mode. After its own slave address and the R bit
have been received, the serial interrupt flag is set and a valid status code can be read
from SSCS. This status code is used to vector to an interrupt service routine. The appro-
priate action to be taken for each of these status code is detailed in Table . The slave
transmitter mode may also be entered if arbitration is lost while the TWI module is in the
master mode.
If the AA bit is reset during a transfer, the TWI module will transmit the last byte of the
transfer and enter state C0h or C8h. the TWI module is switched to the not addressed
slave mode and will ignore the master receiver if it continues the transfer. Thus the mas-
ter receiver receives all 1’s as serial data. While AA is reset, the TWI module does not
respond to its own slave address. However, the 2-wire bus is still monitored and
address recognition may be resume at any time by setting AA. This means that the AA
bit may be used to temporarily isolate the TWI module from the 2-wire bus.
Miscellaneous States
There are two SSCS codes that do not correspond to a define TWI hardware state
(Table 70 ). These codes are discuss hereafter.
Status F8h indicates that no relevant information is available because the serial interrupt
flag is not set yet. This occurs between other states and when the TWI module is not
involved in a serial transfer.
Status 00h indicates that a bus error has occurred during a TWI serial transfer. A bus
error is caused when a START or a STOP condition occurs at an illegal position in the
format frame. Examples of such illegal positions happen during the serial transfer of an
address byte, a data byte, or an acknowledge bit. When a bus error occurs, SI is set. To
recover from a bus error, the STO flag must be set and SI must be cleared. This causes
the TWI module to enter the not addressed slave mode and to clear the STO flag (no
other bits in SSCON are affected). The SDA and SCL lines are released and no STOP
condition is transmitted.
Notes
the TWI module interfaces to the external 2-wire bus via two port pins: SCL (serial clock
line) and SDA (serial data line). To avoid low level asserting on these lines when the
TWI module is enabled, the output latches of SDA and SLC must be set to logic 1.
Table 65. Bit Frequency Configuration
Bit Frequency ( kHz)
CR2
CR1
CR0
F
OSCA= 12 MHz
F
OSCA = 16 MHz
F
OSCA divided by
0
47
62.5
256
0
1
53.5
71.5
224
0
1
0
62.5
83
192
0
1
75
100
160
1
0
-
Unused
1
0
1
100
133.3
120
1
0
200
266.6
60
1
0.5 <. < 62.5
0.67 <. < 83
96 (256 - reload valueTimer 1)
(reload value range: 0-254 in mode 2)
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