參數(shù)資料
型號: M38047M8-XXXFP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 77/135頁
文件大?。?/td> 2055K
代理商: M38047M8-XXXFP
77
3803/3804 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. 72 START/STOP condition detecting timing diagram
START/STOP Condition Detecting Operation
The START/STOP condition detection operations are shown in
Figures 72, 73, and Table 14. 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 14).
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 14, the BB flag set/
reset time.
Note:
When a STOP condition is detected in the slave mode (MST = 0), an
interrupt request signal
I
2
CIRQ
occurs to the CPU.
Table 14 START condition/STOP condition detecting conditions
Standard clock mode
SSC value + 1 cycle (6.25
μ
s)
Note:
Unit : Cycle number of system 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 I
2
C START/
STOP condition control register is set to
18
16
at
φ
= 4 MHz.
Fig. 73 STOP condition detecting timing diagram
SCL release time
High-speed clock mode
4 cycles (1.0
μ
s)
2 cycles (1.0
μ
s)
2 cycles (0.5
μ
s)
3.5 cycles (0.875
μ
s)
SSC value + 1
2
SSC value + 1
2
SSC value
1
2
Setup time
Hold time
BB flag set/
reset time
cycle
< 4.0
μ
s (3.125
μ
s)
cycle
< 4.0
μ
s (3.125
μ
s)
+ 2 cycles (3.375
μ
s)
H
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S
D
C
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S
A
B
f
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a
g
SCL release time
B
s
B
e
f
t
l
i
a
m
g
t
e
Hold time
B
f
l
a
r
e
s
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t
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Setup
time
S
C
L
SDA
B
f
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a
g
SCL release time
B
g
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