MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 243

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14.4.3 Dedicated baud rate generator
generates a serial clock for transmission/reception of UART00.
(1) Configuration of baud rate generator
The dedicated baud rate generator consists of a source clock selector and a 5-bit programmable counter, and
Separate 5-bit counters are provided for transmission and reception.
Base clock
The clock selected by bits 7 and 6 (TPS001 and TPS000) of baud rate generator control register 00
(BRGC00) is supplied to each module when bit 7 (POWER00) of asynchronous serial interface operation
mode register 00 (ASIM00) is 1. This clock is called the base clock and its frequency is called f
base clock is fixed to low level when POWER00 = 0.
Transmission counter
This counter stops operation, cleared to 0, when bit 7 (POWER00) or bit 6 (TXE00) of asynchronous serial
interface operation mode register 00 (ASIM00) is 0.
It starts counting when POWER00 = 1 and TXE00 = 1.
The counter is cleared to 0 when the first data transmitted is written to transmit shift register 00 (TXS00).
Reception counter
This counter stops operation, cleared to 0, when bit 7 (POWER00) or bit 5 (RXE00) of asynchronous serial
interface operation mode register 00 (ASIM00) is 0.
It starts counting when the start bit has been detected.
The counter stops operation after one frame has been received, until the next start bit is detected.
Remark POWER00: Bit 7 of asynchronous serial interface operation mode register 00 (ASIM00)
event counter
8-bit timer/
50 output
TXE00:
RXE00:
BRGC00:
f
f
f
X
X
X
/2
/2
/2
6
4
2
BRGC00: TPS001, TPS000
Figure 14-11. Configuration of Baud Rate Generator
Bit 6 of ASIM00
Bit 5 of ASIM00
Baud rate generator control register 00
POWER00
Selector
CHAPTER 14 SERIAL INTERFACE UART00
User’s Manual U17890EJ2V0UD
f
XCLK0
BRGC00: MDL004 to MDL000
POWER00, TXE00 (or RXE00)
Match detector
5-bit counter
Baud rate generator
1/2
Baud rate
XCLK0
. The
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