tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 253

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA001
17.2 Control
Low power consumption register 2
Serial interface buffer register
Serial interface buffer register
POFFCR2
SIO0BUF
SIO0BUF
(0x0F76)
(0x0021)
(0x0021)
serial interface data buffer register (SIO0BUF), the serial interface control register (SIO0CR) and the serial interface
status register (SIO0SR).
The synchronous serial interface SIO0 is controlled by the low power consumption registers (POFFCR2), the
Note 1: SIO0BUF is the data buffer for both transmission and reception. The last received data is read each time SIO0BUF is
read. If SIO0BUF has never received data, it is read as "0". When data is written into it, the data is treated as the transmit
data.
SIO0EN
RTCEN
Read/Write
Read/Write
Read/Write
Bit Symbol
Bit Symbol
Bit Symbol
After reset
After reset
After reset
RTC control
SIO0 control
R/W
7
0
7
0
7
1
-
R/W
6
0
6
0
6
1
-
RTCEN
R/W
5
0
5
0
5
1
Page 239
0
1
0
1
Disable
Enable
Disable
Enable
R/W
4
0
4
0
4
1
-
SIO0BUF
SIO0BUF
W
R
R/W
3
0
3
0
3
1
-
R/W
2
0
2
0
2
1
-
R/W
1
0
1
0
1
1
-
TMP89FM42
SIO0EN
R/W
0
0
0
0
0
1