UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 196
UPD78F9222MC(T)-5A4-A
Manufacturer Part Number
UPD78F9222MC(T)-5A4-A
Description
8BIT MCU, 4K FLASH, 256B RAM, 78F9222
Manufacturer
NEC
Datasheet
1.UPD78F9222MCT-5A4-A.pdf
(414 pages)
Specifications of UPD78F9222MC(T)-5A4-A
Controller Family/series
UPD78
No. Of I/o's
17
Ram Memory Size
256Byte
Cpu Speed
10MHz
No. Of Timers
4
No. Of
RoHS Compliant
Core Size
8bit
Program Memory Size
4KB
Oscillator Type
External, Internal
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11.4.2 Asynchronous serial interface (UART) mode
performed.
baud rates.
(1) Registers used
196
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
• 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)
• Asynchronous serial interface control register 6 (ASICL6)
• Input switch control register (ISC)
• Port mode register 4 (PM4)
• Port register 4 (P4)
<1> Set the CKSR6 register (see Figure 11-8).
<2> Set the BRGC6 register (see Figure 11-9).
<3> Set bits 0 to 4 (ISRM6, SL6, CL6, PS60, PS61) of the ASIM6 register (see Figure 11-5).
<4> Set bits 0 and 1 (TXDLV6, DIR6) of the ASICL6 register (see Figure 11-10).
<5> Set bit 7 (POWER6) of the ASIM6 register to 1.
<6> Set bit 6 (TXE6) of the ASIM6 register to 1. → Transmission is enabled.
<7> Write data to transmit buffer register 6 (TXB6). → Data transmission is started.
The basic procedure of setting an operation in the UART mode is as follows.
Caution Take the relationship with the other party of communication into consideration for the port
Set bit 5 (RXE6) of the ASIM6 register to 1. → Reception is enabled.
mode register and port register setting procedures.
unintended start bits (falling signals), set PM43 to 0 (output) after having set P43 to 1.
CHAPTER 11 SERIAL INTERFACE UART6
User’s Manual U16898EJ5V0UD
In order to avoid the generation of
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