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18. Serial Bus Interface (SBI)
18.5 Data Transfer of I2C Bus
TMP89FM42
RA001
Check SBI0SR2<LRB> until it becomes "1" to check that the SCL line on the bus is not pulled down to the
low level by other devices.
After confirming that the bus stays in a free state, generate a start condition in the procedure "18.5.2 Start
condition and slave address generation".
In order to meet the setup time at a restart, take at least 4.7
µ
s of waiting time by the software in the standard
mode I
2
C bus standard or at least 0.6
µ
s of waiting time in the fast mode I
2
C bus standard from the time of
restarting to confirm that a bus is free until the time to generate a start condition.
Note:When the master is in the receiver mode, it is necessary to stop the data transmission from the slave device
before the STOP condition is generated. To stop the transmission, the master device make the slave device
receiving a negative acknowledge. Therefore, SBI0SR2<LRB> is "1" before generating the Restart and it can
not be confirmed that SCL line is not pulled down by other devices. Please confirm the SCL line state by read-
ing the port.
Figure 18-22 Timing Diagram When Restarting
Example :Generate a restart
LD
(SBI0CR2), 0x18
; Sets SBI0CR2<MST>, <TRX> and <BB> to "0" and SBI0CR2<PIN> to
"1"
CHK_BB:
TEST
(SBI0SR2).BB
; Waits until SBI0SR2<BB> becomes "0"
JR
T, CHK_BB
CHK_LRB:
TEST
(SBI0SR2).LRB
; Waits until SBI0SR2<LRB> becomes "1"
JR
F, CHK_LRB
.
.
; Wait time process by the software
.
LD
(SBI0CR2), 0xf8
; Sets SBI0CR2<MST>, <TRX>, <BB> and <PIN> to "1"
Start condition
4.7
µ
s min. in the normal mode or
0.6
µ
s min. in the fast mode
SBI0CR2<MST>="0"
SBI0CR2<TRX>="0"
SBI0CR2<BB>="0"
SBI0CR2<PIN>="1"
SCL0 pin
SCL (Bus)
SDA0 pin
SBI0SR2<LRB>
SBI0SR2<BB>
SBI0CR2<PIN>
SBI0CR2<PIN>="1"
SBI0CR2<BB>="1"
SBI0CR2<TRX>="1"
SBI0CR2<MST>="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: ......