tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 133

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

RA005
8.4 Serial Interface Selecting Function
Serial interface selection control register
(0x0FCB)
SERSEL
assignment can be changed. Two out of three functions, SIO0, UART0 and I
using this selecting function.
On the
The input pins of the 16-bit timer counter A0 input (TCA0 input) can be changed by using this selecting function.
Note 1: The operation for changing SERSEL must be executed while the applicable serial interface and timer counter operations
are stopped. If SERSEL is switched during operation of these peripheral functions, each peripheral function may receive
(transmit) unexpected data and operate improperly.
TCA0SEL
6/2(/
SRSEL2
SRSEL0
Read/Write
Bit Symbol
After reset
16-bit timer counter A0 input switch-
ing
Select UART0/SIO0 input/output
port
Serial interface selection 0
UART1
UART0
TCA0
SIO0
I2C0
, the built-in serial interface (SIO, UART and I
Figure 8-11 Serial Interface Selecting Function
R/W
7
0
TCA0SEL
SERSEL<SRSEL0>
Selector
Selector
10
01
0*
*0
R/W
S
S
6
0
SERSEL<TCA0SEL>
<SRSEL2>
SERSEL
Selector
Selector
S
S
R
5
0
00
01
10
Page 119
00:
01:
10:
00:
01:
10:
11:
11:
1
0
0:
1:
P72 input (TCA0)
P21 input (also used as RXD0)
P91 input (also used as RXD1)
Reserved
Select P20, P21, P22
Select PB4, PB5, PB6
Select UART0, I2C0
Select UART0, SIO0
Select SIO0, I2C0
Reserved
P91 (RXD1)
SRSEL2
P21 (RXD0)
R/W
4
0
Port
Port
Port
Port
Port
2
C) communication pins and interrupt source
R
3
0
2
C0, can be used at the same time by
P90 (TXD1)
P91 (RXD1)
PB4 (TXD0 / SO0)
PB5 (RXD0 / SI0)
PB6 (SCLK0)
P20 (TXD0 / SO0)
P21 (RXD0 / SI0)
P22 (SCLK0)
P23 (SDA0 / SO0)
P24 (SCL0 / SI0)
P25 (SCLK0)
P72 (TCA0)
R
2
0
R/W
1
0
SRSEL0
TMP89FM42
R/W
0
0