UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 308

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

308
INTST6n
Notes 1.
Remark The interval between each field is controlled by software.
LIN bus
TXD6n
Figures 14-1 and 14-2 outline the transmission and reception operations of LIN.
Cautions 6. If data is continuously transmitted, the communication timing from the stop bit to the next
Remarks 1. LIN stands for Local Interconnect Network and is a low-speed (1 to 20 kbps) serial
Note 3
2.
3.
n = 0, 1
The wakeup signal frame is substituted by 80H transmission in the 8-bit mode.
The sync break field is output by hardware. The output width is the bit length set by bits 4 to 2 (SBL62n
to SBL60n) of asynchronous serial interface control register 6n (ASICL6n). If more precise output width
adjustment is necessary, use baud rate generator control register 6n (BRGC6n)
(see 14.4.2 (2) (h) SBF transmission).
INTST6n is output on completion of each transmission. It is also output when SBF is transmitted.
2. n = 0, 1
start bit is extended two operating clocks of the macro. However, this does not affect the
result of communication because the reception side initializes the timing when it has
detected a start bit. Do not use the continuous transmission function if the interface is
used in LIN communication operation.
communication protocol intended to aid the cost reduction of an automotive network.
LIN communication is single-master communication, and up to 15 slaves can be connected to
one master.
The LIN slaves are used to control the switches, actuators, and sensors, and these are
connected to the LIN master via the LIN network.
Normally, the LIN master is connected to a network such as CAN (Controller Area Network).
In addition, the LIN bus uses a single-wire method and is connected to the nodes via a
transceiver that complies with ISO9141.
n the LIN protocol, the master transmits a frame with baud rate information and the slave receives
it and corrects the baud rate error. Therefore, communication is possible when the baud rate error
in the slave is ±15% or less.
signal frame
8 bits
Wakeup
Note 1
CHAPTER 14 SERIAL INTERFACES UART60 AND UART61
Figure 14-1. LIN Transmission Operation
13-bit
transmission
break field
Sync
Note 2
User’s Manual U17554EJ4V0UD
SBF
transmission
Sync
field
55H
transmission
Identifier
Data
field
transmission
Data field
Data
transmission
Data field Checksum
Data
transmission
field
Data