Page 202
16. Serial Bus Interface(I2C Bus) Ver.-D (SBI)
16.5 I2C Bus Control
T
5CL8
When a stop condition on the bus or an arbitration lost is detected, the TRX is cleared to “0” by the hardware.
" Table 16-2 TRX changing conditions in each mode " shows TRX changing conditions in each mode and TRX
value after changing
When a serial bus interface circuit operates in the free data format, a slave address and a direction bit are not
recognized. They are handled as data just after generating a start condition. The TRX is not changed by a hard-
ware.
16.5.7 Start/stop condition generation
When the BB (Bit5 in SBISRB) is “0”, a slave address and a direction bit which are set to the SBIDBR are
output on a bus after generating a start condition by writing “1” to the MST, TRX, BB and PIN. It is necessary
to set ACK to “1” beforehand.
Figure 16-5 Start Condition Generation and Slave Address Generation
When the BB is “1”, sequence of generating a stop condition is started by writing “1” to the MST, TRX and
PIN, and “0” to the BB. Do not modify the contents of MST, TRX, BB and PIN until a stop condition is gener-
ated on a bus.
When a stop condition is generated and the SCL line on a bus is pulled-down to low level by another device,
a stop condition is generated after releasing the SCL line.
Figure 16-6 Stop Condition Generation
The bus condition can be indicated by reading the contents of the BB (Bit5 in SBISRB). The BB is set to “1”
when a start condition on a bus is detected (Bus Busy State) and is cleared to “0” when a stop condition is
detected (Bus Free State).
16.5.8 Interrupt service request and cancel
When a serial bus interface circuit is in the master mode and transferring a number of clocks set by the BC
and the ACK is complete, a serial bus interface interrupt request (INTSBI) is generated.
Table 16-2 TRX changing conditions in each mode
Mode
Direction Bit
Conditions
TRX after Changing
Slave
Mode
"0"
A received slave address is
the same value set to I2CAR
"0"
"1"
"1"
Master
Mode
"0"
ACK signal is returned
"1"
"1"
"0"
Slave address and the direction bit
Start condition
Acknowledge signal
A6
A5
2
3
4
5
6
7
8
9
A4
A3
A2
A1
A0
R/W
1
SCL pin
SDA pin
Stop condition
SCL pin
SDA pin
Содержание CEM2100/00
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Страница 19: ...PCB LAYOUT SD BOARD TOP SIDE VIEW ...
Страница 20: ...20 PCB LAYOUT CD CONNECTOR TOP SIDE VIEW ...
Страница 21: ...PCB LAYOUT ISO BOARD BOTTOM SIDE VIEW 21 ...
Страница 22: ...22 SET EXPLODER VIEW DRAWING ...
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Страница 113: ...Revision History Date Revision 2008 7 31 1 First Release ...
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Страница 126: ...Page 4 1 3 Block Diagram T5CL8 1 3 Block Diagram Figure 1 2 Block Diagram ...
Страница 130: ...Page 8 1 4 Pin Names and Functions T5CL8 ...
Страница 155: ...Page 33 T5CL8 ...
Страница 156: ...Page 34 2 Operational Description 2 3 Reset Circuit T5CL8 ...
Страница 186: ...Page 64 5 I O Ports 5 8 Port P7 P77 to P70 T5CL8 ...
Страница 194: ...Page 72 6 Watchdog Timer WDT 6 3 Address Trap T5CL8 ...
Страница 214: ...Page 92 8 16 Bit TimerCounter 1 TC1 8 3 Function T5CL8 ...
Страница 270: ...Page 148 12 Asynchronous Serial interface UART1 12 9 Status Flag T5CL8 ...
Страница 280: ...Page 158 13 Asynchronous Serial interface UART2 13 9 Status Flag T5CL8 ...
Страница 332: ...Page 210 16 Serial Bus Interface I2C Bus Ver D SBI 16 6 Data Transfer of I2C Bus T5CL8 ...
Страница 342: ...Page 220 17 10 bit AD Converter ADC 17 6 Precautions about AD Converter T5CL8 ...
Страница 354: ...Page 232 19 Flash Memory 19 4 Access to the Flash Memory Area T5CL8 ...
Страница 388: ...Page 266 21 Input Output Circuit 21 2 Input Output Ports T5CL8 ...
Страница 397: ...Page 275 T5CL8 23 Package Dimensions LQFP64 P 1010 0 50D Rev 01 Unit mm ...
Страница 398: ...Page 276 23 Package Dimensions T5CL8 ...
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Страница 428: ...TC94B14MFG 2010 01 12 28 Package LQFP80 P 1212 0 50F Weight 0 6 g Typical ...