Page 269
TMP89FM42
RA001
Figure 18-5 Number of Clocks for Data Transfer and SBI0CR1<BC> and SBI0CR1<ACK>
The relationship between the number of clocks for data transfer and SBI0CR1<BC> and
SBI0CR1<ACK> is shown in Table 18-1.
BC is cleared to "000" by the start condition.
Therefore, the slave address and the direction bit are always transferred in 8-bit units. In other cases, BC
keeps the set value.
Note: SBI0CR1<ACK> must be set before transmitting or receiving a slave address. When SBI0CR1<ACK>
is cleared, the slave address match detection and the direction bit detection are not executed properly.
18.4.3.2 Output of an acknowledge signal
In the acknowledgment mode, the SDA0 pin changes as follows during the period of the clocks for an
acknowledge signal.
• In the master mode
In the transmitter mode, the SDA0 pin is released to receive an acknowledge signal from the
receiver during the period of the clocks for an acknowledge signal. In the receiver mode, the
SDA0 pin is pulled down to the low level and an acknowledge signal is generated during the
period of the clocks for an acknowledge signal.
• In the slave mode
When a match between the received slave address and the slave address set to I2C0AR<SA>
is detected or when a GENERAL CALL is received, the SDA0 pin is pulled down to the low
level and an acknowledge signal is generated during the period of the clocks for an acknowl-
edge signal.
Table 18-1 Relationship between the Number of Clocks for Data Transfer and SBI0CR1<BC>
and SBI0CR1<ACK>
BC
ACK=0 (Non-acknowledgment mode)
ACK=1 (Acknowledgment mode)
Number of clocks for data
transfer
Number of data bits
Number of clocks for data
transfer
Number of data bits
000
8
8
9
8
001
1
1
2
1
010
2
2
3
2
011
3
3
4
3
100
4
4
5
4
101
5
5
6
5
110
6
6
7
6
111
7
7
8
7
2
2
3
3
4
4
5
6
1
1
SBI0CR1<BC>="110",
SBI0CR1<ACK>="0"
S
BI0CR1<BC>="011",
SBI0CR1<ACK>="1"
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......