upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 235
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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10.4.2 Asynchronous serial interface (UART) mode
performed.
baud rates.
(1) Registers used
POWER6
In this mode, data of 1 byte is transmitted/received following a start bit, and a full-duplex operation can be
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 6 (ASIM6)
• Asynchronous serial interface reception error status register 6 (ASIS6)
• Asynchronous serial interface transmission status register 6 (ASIF6)
• Clock selection register 6 (CKSR6)
• Baud rate generator control register 6 (BRGC6)
• 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 CKSR6 register (see Figure 10-5).
<2> Set the BRGC6 register (see Figure 10-6).
<3> Set bits 0 to 4 (ISRM6, SL6, CL6, PS60, PS61) of the ASIM6 register (see Figure 10-2).
<4> Set bit 7 (POWER6) of the ASIM6 register to 1.
<5> Set bit 6 (TXE6) of the ASIM6 register to 1. → Transmission is enabled.
<6> Write data to transmit buffer register 6 (TXB6). → 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 (RXE6) of the ASIM6 register to 1. → Reception is enabled.
TXE6
POWER6: Bit 7 of asynchronous serial interface operation mode register 6 (ASIM6)
TXE6:
RXE6:
PM1×:
P1×:
0
0
1
1
and port register.
RXE6
0
1
0
1
don’t care
Bit 6 of ASIM6
Bit 5 of ASIM6
Port mode register
Port output latch
Table 10-2. Relationship Between Register Settings and Pins
PM13
×
×
Note
Note
0
0
CHAPTER 10 SERIAL INTERFACE UART6
P13
×
×
Preliminary User’s Manual U19014EJ1V0UD
Note
Note
1
1
PM14
×
×
Note
1
Note
1
P14
×
×
Note
×
Note
×
Transmission/
Transmission
Reception
Operation
reception
UART6
Stop
T
X
D6/P13
T
T
P13
P13
X
X
D6
D6
Pin Function
R
X
R
R
D6/P14
P14
P14
X
X
D6
D6
235
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