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M37151 Datasheet(PDF) 33 Page - Renesas Technology Corp

Part No. M37151
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M37151 Datasheet(HTML) 33 Page - Renesas Technology Corp

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP
MITSUBISHI MICROCOMPUTERS
32
Rev. 1.0
8.6.3 I2C Clock Control Register
The I2C clock control register (address 00FA16) is used to set ACK
control, SCL mode and SCL frequency.
(1) Bits 0 to 4: SCL frequency control bits (CCR0–CCR4)
These bits control the SCL frequency.
(2) Bit 5: SCL mode specification bit (FAST MODE)
This bit specifies the SCL mode. When this bit is set to “0,” the stan-
dard clock mode is set. When the bit is set to “1,” the high-speed
clock mode is set.
(3) Bit 6: ACK bit (ACK BIT)
This bit sets the SDA status when an ACK clockis generated. When
this bit is set to “0,” the ACK return mode is set and SDA goes to
LOW at the occurrence of an ACK clock. When the bit is set to “1,”
the ACK non-return mode is set. The SDA is held in the HIGH status
at the occurrence of an ACK clock.
However, when the slave address matches the address data in the
reception of address data at ACK BIT = “0,” the SDA automatically
goes to LOW (ACK is returned). If there is a mismatch between the
slave address and the address data, the SDA automatically goes to
HIGH (ACK is not returned).
✽ACK clock: Clock for acknowledgement
Fig. 8.6.4 I2C Clock Control Register
(4) Bit 7: ACK clock bit (ACK)
This bit specifies a mode of acknowledgment which is an acknowl-
edgment response of data transmission. When this bit is set to “0,”
the no ACK clock mode is set. In this case, no ACK clock occurs
after data transmission. When the bit is set to “1,” the ACK clock
mode is set and the master generates an ACK clock upon comple-
tion of each 1-byte data transmission.The device for transmitting
address data and control data releases the SDA at the occurrence of
an ACK clock (make SDA HIGH) and receives the ACK bit generated
by the data receiving device.
Note: Do not write data into the I2C clock control register during transmission.
If data is written during transmission, the I2C clock generator is reset, so
that data cannot be transmitted normally.
b7 b6 b5 b4 b3 b2 b1 b0
I2C clock control register (S2) [Address 00FA16]
I2C Clock Control Register
0
to
4
SCL frequency control
bits
(CCR0 to CCR4)
7
5
6
SCL mode
specification bit
(FAST MODE)
0: Standard clock mode
1: High-speed clock mode
0
Standard
clock
mode
Functions
Name
After reset
RW
B
0
0
0
ACK bit
(ACK BIT)
ACK clock bit
(ACK)
0: ACK is returned.
1: ACK is not returned.
0: No ACK clock
1: ACK clock
High speed
clock mode
Setup disabled
Setup disabled
00 to 02
Setup disabled
333
03
Setup disabled
250
04
100
400 (See note)
05
83.3
166
06
500/CCR value 1000/CCR value
17.2
34.5
1D
16.6
33.3
1E
16.1
32.3
1F
(
φ = 4 MHz, unit : kHz)
Note. At 400kHz in the high-speed clock mode, the duty is as below.
“0” period : “1” period = 3 : 2
In the other cases, the duty is as below.
“0” period : “1” period = 1 : 1
Setup value
of CCR4–
CCR0
RW
RW
RW
RW


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