M37212 Mitsubishi, M37212 Datasheet - Page 39

• Manufacturer Part Number: M37212
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
• Manufacturer: Mitsubishi

8.6.6 START Condition Generation Method
When the ESO bit of the I
execute a write instruction to the I
to set the MST, TRX and BB bits to “1.” A START condition will then
be generated. After that, the bit counter becomes “000
for 1 byte is output. The START condition generation timing and BB
bit set timing are different in the standard clock mode and the high-
speed clock mode. Refer to Figure 8.6.9 for the START condition
generation timing diagram, and Table 8.6.2 for the START condition/
STOP condition generation timing table.
8.6.7 STOP Condition Generation Method
When the ESO bit of the I
execute a write instruction to the I
for setting the MST bit and the TRX bit to “1” and the BB bit to “0”. A
STOP condition will then be generated. The STOP condition genera-
tion timing and the BB flag reset timing are different in the standard
clock mode and the high-speed clock mode. Refer to Figure 8.6.10
for the STOP condition generation timing diagram, and Table 8.6.2
for the START condition/STOP condition generation timing table.
Rev. 1.0
2
2
C control register (address 00DA
C control register (address 00DA
2
2
C status register (address 00D9
C status register (address 00D9
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
2
” and an SCL
16
16
) is “1,”
) is “1,”
16
16
)
)
Fig. 8.6.9 START Condition Generation Timing Diagram
Fig. 8.6.10 STOP Condition Generation Timing Diagram
Table 8.6.2 START Condition/STOP Condition Generation Tim-
Note: Absolute time at
Setup time
(START condition)
Setup time
(STOP condition)
Hold time
Set/reset time
for BB flag
I
write signal
SCL
SDA
BB flag
2
I
w r i t e s i g n a l
S C L
S D A
B B f l a g
C status register
2
C s t a t u s r e g i s t e r
Item
number of
ing Table
cycles.
Standard Clock Mode
with ON-SCREEN DISPLAY CONTROLLER
4.25 s (17 cycles)
5.0 s (20 cycles)
5.0 s (20 cycles)
3.0 s (12 cycles)
MITSUBISHI MICROCOMPUTERS
= 4 MHz. The value in parentheses denotes the
Setup
Setup
time
time
S e t u p
t i m e
M37212EFSP/FP
Hold time
Set time for
BB flag
H o l d t i m e
R e s e t t i m e f o r
B B f l a g
High-speed Clock Mode
2.5 s (10 cycles)
1.75 s (7 cycles)
2.5 s (10 cycles)
1.5 s (6 cycles)
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