TMP86FS49AFG Toshiba Semiconductor, TMP86FS49AFG Datasheet - Page 208

• Manufacturer Part Number: TMP86FS49AFG
• Description: 8-Bit Microcontroller
• Manufacturer: Toshiba Semiconductor

15.3 Function
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SI2 pin
SIO2CR<SIOS>
SIO2SR<SIOF>
SIO2SR<SEF>
SCK2
SO2 pin
INTSIO2
interrupt
request
SIO2SR<TXF>
SIO2TDB
SIO2SR<RXF>
SIO2RDB
pin output
Figure 15-14 Example of External Clock and MSB Transmit/Receive Mode
(4)
errors occur transmits or receives.
Writing transmit
data A
Transmit/receive error processing
Transmit/receive errors occur on the following situation. Corrective action is different, which
(a) Transmit errors
A
Transmit errors occur on the following situation.
• Shift operation starts before writing next transmit data to SIO2TDB in external clock op-
A7 A6
D7 D6 D5 D4 D3 D2 D1 D0 E7 E6 E5 E4 E3 E2 E1 E0 F7 F6 F5 F4 F3 F2 F1 F0
eration.
If transmit errors occur during transmit operation, SIO2SR<TXERR> is set to “1” im-
mediately after starting shift operation. And INTSIO2 interrupt request is generated af-
ter all of the 8-bit data has been received.
If shift operation starts before writing data to SIO2TDB after SIO2CR<SIOS> is set to
“1”, SIO2SR<TXERR> is set immediately after starting shift operation. And INTSIO2
interrupt request is generated after all of the 8-bit data has been received.
SO2 pin is kept in high level when SIO2SR<TXERR> is set to “1”. When transmit error
occurs, transmit operation must be forcibly stop by writing SIO2CR<SIOINH> to “1”
after the received data is read from SIO2RDB. In this case, SIO2CR<SIOS>, SIO2SR
register, SIO2RDB register and SIO2TDB register are initialized.
Writing transmit data
Start shift
operation
A5 A4 A3 A2 A1 A0 B7 B6 B5 B4 B3 B2 B1 B0 C7 C6 C5 C4 C3 C2 C1 C0
Reading received
data D
Writing transmit
data B
Reading received data
Page 192
D
B
Start shift
operation
Writing transmit
data C
Reading received
data E
E
C
Start shift
operation
Clearing SIOS
Reading received
data F
F
TMP86FS49AFG