upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 211

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

11.4.2 Asynchronous serial interface (UART) mode
baud rates.
(1) Registers used
POWER0
In this mode, 1-byte data is transmitted/received following a start bit, and a full-duplex operation can be performed.
A dedicated UART baud rate generator is incorporated, so that communication can be executed at a wide range of
Note Can be set as port function.
Remark ×:
0
1
• Asynchronous serial interface operation mode register 0 (ASIM0)
• Asynchronous serial interface reception error status register 0 (ASIS0)
• Baud rate generator control register 0 (BRGC0)
• Port mode register 1 (PM1)
• Port register 1 (P1)
The basic procedure of setting an operation in the UART mode is as follows.
<1> Set the BRGC0 register (see Figure 11-4).
<2> Set bits 1 to 4 (SL0, CL0, PS00, and PS01) of the ASIM0 register (see Figure 11-2).
<3> Set bit 7 (POWER0) of the ASIM0 register to 1.
<4> Set bit 6 (TXE0) of the ASIM0 register to 1. → Transmission is enabled.
<5> Write data to the TXS0 register. → Data transmission is started.
Caution Take relationship with the other party of communication when setting the port mode register
The relationship between the register settings and pins is shown below.
Set bit 5 (RXE0) of the ASIM0 register to 1. → Reception is enabled.
TXE0
POWER0: Bit 7 of asynchronous serial interface operation mode register 0 (ASIM0)
TXE0:
RXE0:
PM1×:
P1×:
0
0
1
1
and port register.
CHAPTER 11 SERIAL INTERFACE UART0 (
RXE0
0
1
0
1
don’t care
Bit 6 of ASIM0
Port mode register
Bit 5 of ASIM0
Port output latch
Table 11-2. Relationship Between Register Settings and Pins
PM10
×
×
Note
Note
0
0
P10
×
×
Note
Note
1
1
User’s Manual U16846EJ3V0UD
PM11
×
×
Note
1
Note
1
P11
×
×
×
Note
Note
×
PD78F0102H AND 78F0103H ONLY)
Transmission/
Transmission
Reception
Operation
reception
UART0
Stop
TxD0/SCK10/P10
SCK10/P10
SCK10/P10
TxD0
TxD0
Pin Function
RxD0/SI10/P11
SI10/P11
SI10/P11
RxD0
RxD0
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