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TMP89FM42
RA001
Figure 18-17 Generating the Start Condition and the Slave Address
18.5.3 1-word data transfer
Check SBI0SR2<MST> by the interrupt process after a 1-word data transfer is completed, and determine
whether the mode is a master or slave.
18.5.3.1 When SBI0SR2<MST> is "1" (Master mode)
Check SBI0SR2<TRX> and determine whether the mode is a transmitter or receiver.
(1)
When SBI0SR2<TRX> is "1" (Transmitter mode)
Check SBI0SR2<LRB>. When SBI0SR2<LRB> is "1", a receiver does not request data. Imple-
ment the process to generate a stop condition (described later) and terminate data transfer.
When SBI0SR2<LRB> is "0", the receiver requests subsequent data. When the data to be transmit-
ted subsequently is other than 8 bits, set SBI0CR1<BC> again, set SBI0CR1<ACK> to "1", and
write the transmitted data to SBI0DBR.
After writing the data, SBI0CR2<PIN> becomes "1", a serial clock pulse is generated for transfer-
ring the subsequent 1-word data from the SCL0 pin, and then the 1-word data is transmitted from the
SDA0 pin.
After the data is transmitted, an interrupt request occurs. SBI0CR2<PIN> become "0" and the
SCL0 pin is set to the low level. If the data to be transferred is more than one word in length, repeat
the procedure from the SBI0SR2<LRB> checking above.
Example :Generate the start condition
CHK_BB:
TEST
(SBI0SR2).BB
; Confirms that the bus is free
JR
F, CHK_BB
LD
(SBI0DBR), 0xcb
; The transmission slave address 0x65 and the direction bit "1"
LD
(SBI0CR2), 0xf8
; Write "1" to SBI0CR2<MST>, <TRX>, <BB> and <PIN> to "1"
Start condition
Slave a Direction bit
2
3
4
5
6
7
8
9
1
Acknowledgem
ent signal from
a slave
Interrupt request
signal
SBI0CR1<PIN>
SCL0 pin
SDA0 pin
SBI0CR2 <TRX> is cleared to "0" when
the direction bit is "1"and an
acknowledge signal is returned.
SBI0CR2<TRX>
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: ......