參數(shù)資料
型號: M38049FFHSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8.4 MHz, MICROCONTROLLER, PDIP64
封裝: 0.750 INCH, 1.78 MM PITCH, PLASTIC, SDIP-64
文件頁數(shù): 80/116頁
文件大?。?/td> 1261K
代理商: M38049FFHSP
Rev.1.01
Jan 25, 2005
page 66 of 114
REJ03B0131-0101Z
3804 Group (Spec. H)
Fig. 64 START/STOP condition detecting timing diagram
START/STOP Condition Detecting Operation
The START/STOP condition detection operations are shown in
Figures 64, 65, and Table 11. The START/STOP condition is set
by the START/STOP condition set bit.
The START/STOP condition can be detected only when the input
signal of the SCL and SDA pins satisfy three conditions: SCL re-
lease time, setup time, and hold time (see Table 11).
The BB flag is set to “1” by detecting the START condition and is
reset to “0” by detecting the STOP condition.
The BB flag set/reset timing is different in the standard clock mode
and the high-speed clock mode. Refer to Table 11, the BB flag set/
reset time.
Note: When a STOP condition is detected in the slave mode (MST = 0), an
interrupt request signal “I2CIRQ” occurs to the CPU.
Table 11 START condition/STOP condition detecting conditions
Note: Unit : Cycle number of internal clock
φ
SSC value is the decimal notation value of the START/STOP condi-
tion set bits SSC4 to SSC0. Do not set “0” or an odd number to SSC
value. The value in parentheses is an example when the I2C START/
STOP condition control register is set to “1816” at
φ = 4 MHz.
Fig. 65 STOP condition detecting timing diagram
SCL release time
Standard clock mode
High-speed clock mode
4 cycles (1.0
s)
2 cycles (0.5
s)
2 cycles (0.5
s)
3.5 cycles (0.875
s)
SSC value + 1
2
SSC value + 1
2
SSC value –1
2
Setup time
Hold time
BB flag set/
reset time
SSC value + 1 cycle (6.25
s)
cycle < 4.0
s (3.125 s)
cycle < 4.0
s (3.125 s)
+ 2 cycles (3.375
s)
Hold time
Setup
time
SCL
SDA
BB flag
SCL release time
BB flag
set time
Hold time
Setup
time
SCL
SDA
BB flag
SCL release time
BB flag
reset
time
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