Datasheet

78K0/Ix2 CHAPTER 14 SERIAL INTERFACE UART6/DALI
R01UH0010EJ0500 Rev.5.00 458
Feb 28, 2012
(g) Noise filter of receive data
The RxD6 signal is sampled with the base clock output by the prescaler block.
If two sampled values are the same, the output of the match detector changes, and the data is sampled as input
data.
Because the circuit is configured as shown in Figure 14-23, the internal processing of the reception operation is
delayed by two clocks from the external signal status.
Figure 14-23. Noise Filter Circuit
Internal signal B
Internal signal A
Match detector
In
Base clock
R
X
D6/P14
Q
In
LD_EN
Q
(h) SBF transmission
When the device is use in LIN communication operation, the SBF (Synchronous Break Field) transmission control
function is used for transmission. For the transmission operation of LIN, refer to Figure 14-1 LIN Transmission
Operation.
When bit 7 (POWER6) of UART/DALI operation mode register 6 (ASIM6) is set to 1, the TXD6 pin outputs high
level. Next, when bit 6 (TXE6) of ASIM6 is set to 1, the transmission enabled status is entered, and SBF
transmission is started by setting bit 5 (SBTT6) of LIN operation control register 6 (ASICL6) to 1.
Thereafter, a low level of bits 13 to 20 (set by bits 4 to 2 (SBL62 to SBL60) of ASICL6) is output. Following the
end of SBF transmission, the transmission completion interrupt request (INTST6) is generated and SBTT6 is
automatically cleared. Thereafter, the normal transmission mode is restored.
Transmission is suspended until the data to be transmitted next is written to UART/DALI transmit buffer register 6
(TXB6), or until SBTT6 is set to 1.
Figure 14-24. SBF Transmission
T
X
D6
INTST6
SBTT6
1 2 3 4 5 6 7 8 9 10 11 12 13 Stop
Remark T
XD6: TXD6 pin (output)
INTST6: Transmission completion interrupt request
SBTT6: Bit 5 of LIN operation control register 6 (ASICL6)