UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 442

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

16.1 SWITCHING BETWEEN ASYNCHRONOUS SERIAL INTERFACE MODE AND 3-WIRE SERIAL I/O MODE
these modes is performed in accordance with the settings of the asynchronous serial interface mode register (ASIM/ASIM2)
and the clocked serial interface mode register (CSIM1/CSIM2) as shown in Figure 16-1.
402
The asynchronous serial interface mode and 3-wire serial I/O mode cannot be used simultaneously. Switching between
ASIM2
CSIM1
CSIM2
ASIM
Figure 16-1 Switching Between Asynchronous Serial Interface Mode and 3-Wire Serial I/O Mode
CTXE1
CTXE2 CRXE2
TXE2
TXE
7
7
CRXE1
RXE2
RXE
6
6
CHAPTER 16 ASYNCHRONOUS SERIAL INTERFACE/3-WIRE SERIAL I/O
PS21
PS1
5
5
0
0
PS20
PS0
4
4
0
0
CL2
CL
3
3
0
0
DIR1
DIR2 CSCK2
SL2
SL
2
2
CSCK1
ISRM2 SCK2
ISRM
1
1
SCK
0
0
0
0
TXE2
Asynchronous serial interface mode operation
specification (see Figure 16-3)
3-wire serial I/O mode operation specification
(see Figure 16-11)
Address
0FF88H
0FF89H
TXE
Address
0FF84H
0FF85H
0
0
0
0
0
1
1
Other than the above
RXE2
RXE
0
0
0
0
1
0
1
On Reset
On Reset
00H
00H
00H
00H
CTXE1
CTXE2
0
0
1
1
0
0
0
CRXE1
CRXE2
R/W
R/W
R/W
R/W
R/W
R/W
0
1
0
1
0
0
0
Operating Mode
Operation-stopped
mode
Setting prohibited
3-wire serial
I/O mode
Asynchronous
serial interface
mode