M37212 Mitsubishi, M37212 Datasheet - Page 40

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

8.6.8 START/STOP Condition Detect Conditions
The START/STOP condition detect conditions are shown in
Figure 8.6.11 and Table 8.6.3. Only when the 3 conditions of Table
8.6.3 are satisfied, a START/STOP condition can be detected.
Note: When a STOP condition is detected in the slave mode
Table 8.6.3 START Condition/STOP Condition Detect Conditions
Note: Absolute time at = 4 MHz. The value in parentheses denotes the num-
40
Fig. 8.6.11 START Condition/STOP Condition Detect Timing Dia-
6.5 s (26 cycles) < SCL
3.25 s (13 cycles) < Setup time
3.25 s (13 cycles) < Hold time
( S T A R T c o n d i t i o n )
( S T O P c o n d i t i o n )
ber of
Standard Clock Mode
(MST = 0), an interrupt request signal “IICIRQ” is generated to the
CPU.
S C L
S D A
S D A
cycles.
gram
release time
S e t u p
S e t u p
t i m e
t i m e
S C L r e l e a s e t i m e
1.0 s (4 cycles) < SCL
0.5 s (2 cycles) < Setup time
0.5 s (2 cycles) < Hold time
High-speed Clock Mode
H o l d t i m e
H o l d t i m e
M37212M4/M8–XXXSP, M37212M6–XXXSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
release time
8.6.9 Address Data Communication
There are two address data communication formats, namely, 7-bit
addressing format and 10-bit addressing format. The respective ad-
dress communication formats is described below.
(1) 7-bit addressing format
To meet the 7-bit addressing format, set the 10BIT SAD bit of the I
control register (address 00DA
transmitted from the master is compared with the high-order 7-bit
slave address stored in the I
At the time of this comparison, address comparison of the RBW bit of
the I
transmission format when the 7-bit addressing format is selected,
refer to Figure 8.6.12, (1) and (2).
(2) 10-bit addressing format
To meet the 10-bit addressing format, set the 10BIT SAD bit of the
I
is made between the first-byte address data transmitted from the
master and the 7-bit slave address stored in the I
(address 00D8
parison between the RBW bit of the I
00D8
transmitted from the master is made. In the 10-bit addressing mode,
the R/W bit which is the last bit of the address data not only specifies
the direction of communication for control data but also is processed
as an address data bit.
When the first-byte address data matches the slave address, the
AAS bit of the I
the second-byte address data is stored into the I
(address 00D7
ond-byte data and the slave address by software. When the address
data of the 2nd bytes matches the slave address, set the RBW bit of
the I
processing can match the 7-bit slave address and R/W data, which
are received after a RESTART condition is detected, with the value
of the I
sion format when the 10-bit addressing format is selected, refer to
Figure 8.6.12, (3) and (4).
2
C control register (address 00DA
2
2
C address register (address 00D8
16
C address register (address 00D8
2
) and the R/W bit which is the last bit of the address data
C address register (address 00D8
2
16
16
C status register (address 00D9
). At the time of this comparison, an address com-
), make an address comparison between the sec-
with ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
2
C address register (address 00D8
16
M37212EFSP/FP
) to “0.” The first 7-bit address data
16
) to “1.” An address comparison
2
C address register (address
16
16
) is not made. For the data
16
) to “1” by software. This
). For the data transmis-
16
2
2
C data shift register
C address register
) is set to “1.” After
Rev. 1.0
16
2
C
).