
ML62Q1000 Series User's Manual
Chapter 12
I2C Bus Unit
FEUL62Q1000
12-10
12.2.7 I
2
C Bus 0 Mode Register (Master) (I2UM0MOD)
I2UM0MOD is a special function register (SFR) used to set the operation mode in the master mode.
Address:
0xF6CA (I2UM0MDL/I2UM0MOD)
,
0xF6CB (I2UM0MDH)
Access:
R/W
Access size:
8/16bit
Initial value:
0x0200
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word
I2UM0MOD
Byte
I2UM0MDH
I2UM0MDL
Bit
-
-
-
-
-
I2UM0
CD2
I2UM0
CD1
I2UM0
CD0
-
-
I2UM0
SYN
I2UM0
DW1
I2UM0
DW0
I2UM0
MD1
I2UM0
MD0
I2UM0
EN
R/W
R
R
R
R
R
R/W
R/W
R/W
R
R
R/W
R/W
R/W
R/W
R/W
R/W
Initial
value
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Bit no.
Bit symbol
name
Description
15 to
11
-
Reserved bit
10 to 8
I2UM0CD2 to
I2UM0CD0
These bits are used to choose the operating frequency of I
2
C communication in the master
mode.
0
0
0: HSCLK
0
0
1: 1/2HSCLK
0
1
0: 1/4HSCLK (Initial value)
0
1
1: Do not use
1
0
0: LSCLK (*)
1
0
1: 1/2LSCLK
1
1
0: 1/4LSCLK
1
1
1: 1/8LSCLK
(*)
When choosing LSCLK or 1/8LSCLK, "No communication speed reduction" is chosen
regardless the setting of I2UM0DW1 to 0 bits. See Section 12.3.5 "Operation Waveforms" for
details of the communication speed and clock counts.
7, 6
-
Reserved bit
5
I2UM0SYN
This bit is used to choose whether to or not to use the clock stretch (handshake) function in
the master mode. Set this bit to "1" when using the clock stretch function. Setting this bit to
"1" monitors the I
2
C bus, therefore the communication speed gets lower depending on the
load of I
2
C bus.
0: Not use the clock stretch function (Initial value)
1: Use the clock stretch function
4, 3
I2UM0DW1
,
I2UM0DW0
These bits are used to set the communication speed reduction rate of the I
2
C bus unit in the
master mode. Specify this bit not so that the communication speed exceeds 100
kbps/400kbps/1 Mbps. When LSCLK or 1/8 LSCLK is chosen by the I2UM0CD2 to 0 bits, "No
communication speed reduction" is chosen regardless the setting of I2UM0DW1 to 0 bits.
0
0:
No communication speed reduction (initial value)
0
1:
10% communication speed reduction
1
0:
20% communication speed reduction
1
1:
30% communication speed reduction
2, 1
I2UM0MD1
,
I2UM0MD0
These bits are used to set the communication speed of the I
2
C bus unit in the master mode.
0
0:
Standard mode (initial value) (100 kbps*)
0
1:
Fast mode (400 kbps*)
1
0:
1Mbps mode (1Mbps*)
1
1:
1Mbps mode (1Mbps*)
* :
When I2UM0CD2 to 0 bits are "000" and I2UM0SYN bit is "0".
Summary of Contents for ML62Q1000 Series
Page 17: ...Chapter 1 Overview...
Page 112: ...Chapter 2 CPU and Memory Space...
Page 154: ...Chapter 3 Reset Function...
Page 166: ...Chapter 4 Power Management...
Page 196: ...Chapter 5 Interrupts...
Page 248: ...Chapter 6 Clock generation Circuit...
Page 274: ...Chapter 7 Low Speed Time Base Counter...
Page 291: ...Chapter 8 16 Bit Timer...
Page 320: ...Chapter 9 Functional Timer FTM...
Page 382: ...Chapter 10 Watchdog Timer...
Page 402: ...Chapter 11 Serial Communication Unit...
Page 456: ...Chapter 12 I2 C Bus Unit...
Page 491: ...Chapter 13 I2 C Master...
Page 512: ...Chapter 14 DMA Controller...
Page 531: ...Chapter 15 Buzzer...
Page 550: ...Chapter 16 Simplified RTC...
Page 559: ...Chapter 17 GPIO...
Page 594: ...Chapter 18 External Interrupt Function...
Page 612: ...Chapter 19 CRC Generator...
Page 632: ...Chapter 20 Analog Comparator...
Page 644: ...Chapter 21 D A Converter...
Page 655: ...Chapter 22 Voltage Level Supervisor...
Page 676: ...Chapter 23 Successive Approximation Type A D Converter...
Page 709: ...Chapter 24 Regulator...
Page 714: ...Chapter 25 Flash Memory...
Page 743: ...Chapter 26 Code Option...
Page 750: ...Chapter 27 LCD Driver...
Page 788: ...Chapter 28 On Chip Debug Function...
Page 795: ...Chapter 29 Safety Function...
Page 813: ...Appendix A...
Page 881: ...Revision History...