upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 253
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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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10.5 Cautions for Serial Interface UART6
(1) Data frame length during continuous transmission
(2) Operating current in STOP mode
When data is continuously transmitted, the data frame length from a stop bit to the next start bit is extended by
two clocks of base clock from the normal value. However, the result of communication is not affected because
the timing is initialized on the reception side when the start bit is detected.
Where the 1-bit data length is FL, the stop bit length is FLstp, and base clock frequency is f
expression is satisfied.
Therefore, the data frame length during continuous transmission is:
The UART6 operation is stopped in the STOP mode. At this time, the operating current can be reduced by
clearing bits 7 (POWER6), 6 (TXE6), and 5 (RXE6) of the asynchronous serial interface operation mode register
(ASIM6) to 0.
To resume the operation from the standby status, first clear bit 7 (POWER6) of interrupt request flag register 0L
(IF0L), bits 1 (STIF6) and 0 (SRIF6) of interrupt request flag register 0H (IF0H) to 1, and then start operation.
FLstp = FL + 2/f
Data frame length = 11 × FL + 2/f
Start bit
FL
Figure 10-19. Data Frame Length During Continuous Transmission
XCLK6
Bit 0
FL
CHAPTER 10 SERIAL INTERFACE UART6
Bit 1
FL
XCLK6
Preliminary User’s Manual U19014EJ1V0UD
1 data frame
Bit 7
FL
Parity bit
FL
Stop bit
FLstp
Start bit
FL
Start bit of
second byte
XCLK6
Bit 0
FL
, the following
253
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