Page 119
TMP89FM42
RA005
8.4
Serial Interface Selecting Function
On the
TMP89FM42
, the built-in serial interface (SIO, UART and I
2
C) communication pins and interrupt source
assignment can be changed. Two out of three functions, SIO0, UART0 and I
2
C0, can be used at the same time by
using this selecting function.
The input pins of the 16-bit timer counter A0 input (TCA0 input) can be changed by using this selecting function.
Figure 8-11 Serial Interface 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.
Serial interface selection control register
SERSEL
(0x0FCB)
7
6
5
4
3
2
1
0
Bit Symbol
TCA0SEL
SRSEL2
SRSEL0
Read/Write
R/W
R/W
R
R/W
R
R
R/W
R/W
After reset
0
0
0
0
0
0
0
0
TCA0SEL
16-bit timer counter A0 input switch-
ing
00:
01:
10:
11:
P72 input (TCA0)
P21 input (also used as RXD0)
P91 input (also used as RXD1)
Reserved
SRSEL2
Select UART0/SIO0 input/output
port
0:
1:
Select P20, P21, P22
Select PB4, PB5, PB6
SRSEL0
Serial interface selection 0
00:
01:
10:
11:
Select UART0, I2C0
Select UART0, SIO0
Select SIO0, I2C0
Reserved
UART1
P90 (TXD1)
P91 (RXD1)
UART0
SIO0
I2C0
TCA0
P20 (TXD0 / SO0)
P21 (RXD0 / SI0)
P22 (SCLK0)
SERSEL<SRSEL0>
SERSEL<TCA0SEL>
0*
10
Selector
Selector
S
P23 (SDA0 / SO0)
P24 (SCL0 / SI0)
P25 (SCLK0)
P72 (TCA0)
P21 (RXD0)
P91 (RXD1)
01
*0
Selector
S
00
01
10
Selector
S
Port
Port
Port
PB4 (TXD0 / SO0)
PB5 (RXD0 / SI0)
PB6 (SCLK0)
SERSEL
<SRSEL2>
S
1
0
Port
Port
Summary of Contents for TLCS-870/C1 Series
Page 1: ...8 Bit Microcontroller TLCS 870 C1 Series TMP89FM42 查询TMP89FM42供应商 捷多邦 专业PCB打样工厂 24小时加急出货 ...
Page 3: ...Revision History Date Revision 2007 10 25 1 First Release 2007 11 3 2 Contents Revised ...
Page 4: ......
Page 14: ......
Page 18: ...1 3 Block Diagram TMP89FM42 1 3 Block Diagram Figure 1 2 Block Diagram ...
Page 22: ...1 4 Pin Names and Functions TMP89FM42 ...
Page 60: ...2 CPU Core 2 5 Revision History TMP89FM42 ...
Page 76: ...3 Interrupt Control Circuit 3 8 Revision History TMP89FM42 ...
Page 86: ...4 External Interrupt control circuit 4 3 Function TMP89FM42 ...
Page 102: ...7 Voltage Detection Circuit 7 5 Revision History TMP89FM42 ...
Page 126: ...8 I O Ports 8 3 I O Port Registers TMP89FM42 Note 2 i 0 to 1 ...
Page 136: ...8 I O Ports 8 5 Revision History TMP89FM42 ...
Page 142: ...9 Special Function Registers 9 3 SFR3 0x0E40 to 0x0EFF TMP89FM42 ...
Page 146: ...10 Low Power Consumption Function for Peripherals TMP89FM42 ...
Page 149: ...TMP89FM42 11 3 Revision History Rev Description RA001 Deleted SLEEP2 description ...
Page 150: ...11 Divider Output DVO 11 3 Revision History TMP89FM42 ...
Page 220: ...15 Real Time Clock RTC 15 4 Real Time Clock Operation TMP89FM42 ...
Page 250: ...16 Asynchronous Serial Interface UART 16 15 Revision History TMP89FM42 ...
Page 302: ...18 Serial Bus Interface SBI 18 7 Revision History TMP89FM42 ...
Page 338: ...21 Flash Memory 21 4 Toggle Bit D6 TMP89FM42 ...
Page 384: ...22 Serial PROM Mode 22 15 Revision History TMP89FM42 ...
Page 388: ...24 Input Output Circuit 24 1 Control Pins TMP89FM42 ...
Page 404: ...25 Electrical Characteristics 25 11 Revision History TMP89FM42 ...
Page 406: ...26 Package Dimensions TMP89FM42 ...
Page 408: ......