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TMP89FS60 Datasheet(PDF) 297 Page - Toshiba Semiconductor

Part # TMP89FS60
Description  8 Bit Microcontroller
PDF  410 Pages
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Manufacturer  TOSHIBA [Toshiba Semiconductor]
Direct Link  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TMP89FS60 Datasheet(HTML) 297 Page - Toshiba Semiconductor

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Page 283
TMP89FS60
RA001
18.5.4 Stop condition generation
When SBI0CR2<BB> is "1", a sequence of generating a stop condition is started by setting "1" to
SBI0CR2<MST>, SBI0CR2<TRX> and SBI0CR2<PIN> and clearing SBI0CR2<BB> to "0". Do not modify
the contents of SBI0CR2<MST>, SBI0CR2<TRX>, SBI0CR2<BB> and SBI0CR2<PIN> until a stop condi-
tion is generated on a bus.
When a SCL line on a bus is pulled down by other devices, a serial bus interface circuit generates a stop con-
dition after a SCL line is released.
The time from the releasing SCL line until the generating the STOP condition takes tHIGH.
Figure 18-21 Stop Condition Generation
18.5.5 Restart
Restart is used to change the direction of data transfer between a master device and a slave device during
transferring data. The following explains how to restart the serial bus interface circuit.
Clear SBI0CR2<MST>, SBI0CR2<TRX> and SBI0CR2<BB> to "0" and set SBI0CR2 <PIN> to "1". The
SDA0 pin retains the high level and the SCL0 pin is released.
Since this is not a stop condition, the bus is assumed to be in a busy state from other devices.
Check SBI0SR2<BB> until it becomes "0" to check that the SCL0 pin of the serial bus interface circuit is
released.
Example :Generate the stop condition
LD
(SBI0CR2), 0xD8
; Sets SBI0CR2<MST>, <TRX> and <PIN> to "1" and SBI0CR2<BB> to
"0"
CHK_BB:
TEST
(SBI0SR2).BB
;Waits until the bus is set free
JR
T, CHK_BB
Stop condition
If the SCL of the bus is pulled
down by other devices, the stop
condition is generated after it is
released
SDA0 pin
SCL0 pin
SCL (Bus)
SBI0CR2<PIN>
SBI0SR2<BB>
SBI0CR2<MST>="1"
SBI0CR2<TRX>="1"
SBI0CR2<BB>="0"
SBI0CR2<PIN>="1"



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