upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 247

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

10.4.3 Dedicated baud rate generator
generates a serial clock for transmission/reception of UART6.
(1) Configuration of baud rate generator
The dedicated baud rate generator consists of a source clock selector and an 8-bit programmable counter, and
Separate 8-bit counters are provided for transmission and reception.
• Base clock
• Transmission counter
• Reception counter
The clock selected by bits 3 to 0 (TPS63 to TPS60) of clock selection register 6 (CKSR6) is supplied to
each module when bit 7 (POWER6) of asynchronous serial interface operation mode register 6 (ASIM6) is
1. This clock is called the base clock and its frequency is called f
when POWER6 = 0.
This counter stops operation, cleared to 0, when bit 7 (POWER6) or bit 6 (TXE6) of asynchronous serial
interface operation mode register 6 (ASIM6) is 0.
It starts counting when POWER6 = 1 and TXE6 = 1.
The counter is cleared to 0 when the first data transmitted is written to transmit buffer register 6 (TXB6).
If data are continuously transmitted, the counter is cleared to 0 again when one frame of data has been
completely transmitted. If there is no data to be transmitted next, the counter is not cleared to 0 and continues
counting until POWER6 or TXE6 is cleared to 0.
This counter stops operation, cleared to 0, when bit 7 (POWER6) or bit 5 (RXE6) of asynchronous serial
interface operation mode register 6 (ASIM6) 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.
CHAPTER 10 SERIAL INTERFACE UART6
Preliminary User’s Manual U19014EJ1V0UD
XCLK6
. The base clock is fixed to low level
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