UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 399

• 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

16.3.7 Baud rate control function
Remark IPT : Information Processing Time
(1) Prescaler
(2) Data bit time (8-25 time quanta)
Time Segment 1 (TSEG1)
Time Segment 2 (TSEG2)
Resynchronization jump
width(SJW)
The CAN controller has a prescaler that divides the clock (f
CAN protocol layer basic clock (f
256 (refer to 16.6 (12) CAN Bit Rate Prescaler Register (C0BRP)).
One data bit time is defined as shown in Figure 16-18.
The CAN controller sets time segment 1, time segment 2, and reSynchronization Jump Width (SJW) as the
parameter of data bit time, as shown in Figure 16-18. Time segment 1 is equivalent to the total of the
propagation (prop) segment and phase segment 1 that are defined by the CAN protocol specification. Time
segment 2 is equivalent to phase segment 2.
Segment Name
TQ : Time Quanta
Sync segment
2TQ-16TQ
1TQ-8TQ
1TQ-4TQ
Settable Range
Prop segment
TQ
CHAPTER 16 CAN CONTROLLER
Figure 16-18. Segment Setting
) derived from the CAN module system clock (f
User’s Manual U17554EJ4V0UD
Time segment 1(TSEG1)
Data bit time(DBT)
Phase segment 1
IPT of the CAN controller is 0TQ. To conform to the CAN
protocol specification, therefore, a length equal to phase
segment 1 must be set here. This means that the length
of time segment 1 minus 1TQ is the settable upper limit of
time segment 2.
The length of time segment 1 minus 1TQ or 4 TQ,
whichever is smaller.
Notes on Setting to Confirm to CAN Specification
CAN
Sample point (SPT)
) supplied to CAN. This prescaler generates a
Phase segment 2
Time segment 2
(TSEG2)
—
CANMOD
), and divided by 1 to
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