
ML62Q1000 Series User's Manual
Chapter 12
I2C Bus Unit
FEUL62Q1000
12-5
12.2.2 I
2
C Bus Unit 0 Mode Register (I2U0MSS)
I2U0MD is a special function register (SFR) used to choose the Master mode or Slave mode of the I
2
C bus unit.
Address:
0xF6C0 (I2U0MSS)
Access:
R/W
Access size:
8bit
Initial value:
0x00
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word
-
Byte
-
I2U0MSS
Bit
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
I2U0M
D
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R/W
Initial
value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit no.
Bit symbol
name
Description
7 to 1
-
Reserved bit
0
I2U0MD
This bit is used to choose the Master mode or Slave mode of the I
2
C but unit.
0:
Master mode (initial value)
1:
Slave mode
[Note]
Ÿ
Do not write to SFRs for slave function in the master mode and do not write SFRs for master function in
the slave mode.
Ÿ
When using the master function, do not connect multiple master devices on the I
2
C bus.
Ÿ
If powering off this LSI in the slave mode, it disables communications of other devices on the I2C bus.
Remain the power to this LSI when it works as a slave mode until the master device is powered off.
Ÿ
When using the salve function, switch the system clock to the high-speed clock if releasing the
communication wait status.
Ÿ
When using the salve function with multi-slaves connected to the I
2
C bus, conform to the following
conditions while enabling the I
2
C bus function (I2U0MD=1 and I2US0EN=1) regardless communicating or
not.
- Specify SYS_CLK as four time or higher than the I
2
C bus communication speed.
SYS_CLK needs to be 500kHz or higher when the I
2
C bus communication speed is 100kbps.
SYS_CLK needs to be 2MHz or higher when the I
2
C bus communication speed is 400kbps.
SYS_CLK needs to be 4MHz or higher when the I
2
C bus communication speed is 1Mbps.
- Do not use LSCLK as the SYS_CLK.
- Do not enter HALT-H mode while enabling the I
2
C bus function.
Содержание ML62Q1000 Series
Страница 17: ...Chapter 1 Overview...
Страница 112: ...Chapter 2 CPU and Memory Space...
Страница 154: ...Chapter 3 Reset Function...
Страница 166: ...Chapter 4 Power Management...
Страница 196: ...Chapter 5 Interrupts...
Страница 248: ...Chapter 6 Clock generation Circuit...
Страница 274: ...Chapter 7 Low Speed Time Base Counter...
Страница 291: ...Chapter 8 16 Bit Timer...
Страница 320: ...Chapter 9 Functional Timer FTM...
Страница 382: ...Chapter 10 Watchdog Timer...
Страница 402: ...Chapter 11 Serial Communication Unit...
Страница 456: ...Chapter 12 I2 C Bus Unit...
Страница 491: ...Chapter 13 I2 C Master...
Страница 512: ...Chapter 14 DMA Controller...
Страница 531: ...Chapter 15 Buzzer...
Страница 550: ...Chapter 16 Simplified RTC...
Страница 559: ...Chapter 17 GPIO...
Страница 594: ...Chapter 18 External Interrupt Function...
Страница 612: ...Chapter 19 CRC Generator...
Страница 632: ...Chapter 20 Analog Comparator...
Страница 644: ...Chapter 21 D A Converter...
Страница 655: ...Chapter 22 Voltage Level Supervisor...
Страница 676: ...Chapter 23 Successive Approximation Type A D Converter...
Страница 709: ...Chapter 24 Regulator...
Страница 714: ...Chapter 25 Flash Memory...
Страница 743: ...Chapter 26 Code Option...
Страница 750: ...Chapter 27 LCD Driver...
Страница 788: ...Chapter 28 On Chip Debug Function...
Страница 795: ...Chapter 29 Safety Function...
Страница 813: ...Appendix A...
Страница 881: ...Revision History...