upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 308

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

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15.3 Registers Controlling Serial Interface CSI10
(1) Serial operation mode register 10 (CSIM10)
308
Address: FF80H After reset: 00H R/W
CSIM10
Serial interface CSI10 is controlled by the following four registers.
• Serial operation mode register 10 (CSIM10)
• Serial clock selection register 10 (CSIC10)
• Port mode register 1 (PM1)
• Port register 1 (P1)
Notes 1.
Caution Be sure to clear bit 5 to 0.
Symbol
CSIM10 is used to select the operation mode and enable or disable operation.
CSIM10 can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
2.
3.
4.
5.
6.
TRMD10
DIR10
Bit 0 is a read-only bit.
To use P10/SCK10/TxD0, P11/SI10/RxD0, and P12/SO10 as general-purpose ports, set CSIM10 in
the default status (00H).
Bit 0 (CSOT10) of CSIM10 and serial I/O shift register 10 (SIO10) are reset.
Do not rewrite TRMD10 when CSOT10 = 1 (during serial communication).
The SO10 output is fixed to the low level when TRMD10 is 0. Reception is started when data is read
from SIO10.
Do not rewrite DIR10 when CSOT10 = 1 (during serial communication).
CSOT10
CSIE10
CSIE10
0
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Note 5
0
1
1
0
1
0
1
Note 6
Note 4
Figure 15-2. Format of Serial Operation Mode Register 10 (CSIM10)
Disables operation
Enables operation
Receive mode (transmission disabled).
Transmit/receive mode
MSB
LSB
Communication is stopped.
Communication is in progress.
TRMD10
6
Note 1
CHAPTER 15 SERIAL INTERFACE CSI10
Note 2
5
0
User’s Manual U16962EJ3V0UD
and asynchronously resets the internal circuit
Operation control in 3-wire serial I/O mode
DIR10
4
Transmit/receive mode control
Communication status flag
First bit specification
3
0
2
0
Note 3
.
1
0
CSOT10
0