UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 461

• 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

without reading the RHL by the host processor, complete sequence of receptions can not be recovered.
Last in-message
pointer(LIPT)
Last in-message
pointer(LIPT)
As long as the RHL contains 23 or less entries the sequence of occurrence is maintained. If more receptions occur
LIPT is locked.
22
23
23
22
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Receive history list (RHL)
Receive history list(RHL)
Message buffer 7
Message buffer 2
Message buffer 9
Message buffer 6
Message buffer 1
Message buffer 9
Message buffer 5
Message buffer 8
Message buffer 4
Message buffer 3
Message buffer 7
Message buffer 2
Message buffer 9
:
:
:
:
:
:
Figure 16-30. Receive History List
ROVF is set.
CHAPTER 16 CAN CONTROLLER
When message buffer 3
receives and stores more messages
User’s Manual U17554EJ4V0UD
Receive history
list get pointer
(RGPT)
Receive history
list get pointer
(RGPT)
If message is stored in message
buffers 3, 4, and 8
When message buffer 6 is read
When ROVF = 1, message
buffer number is stored
indicated by LIPT-1.
(overwritten) to element
Last in-message
pointer(LIPT)
Last in-message
pointer(LIPT)
When RHL is full
23
22
23
22
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Receive history list(RHL)
Receive history list (RHL)
Message buffer 8
Message buffer 4
Message buffer 3
Message buffer 7
Message buffer 2
Message buffer 9
Message buffer 3
Message buffer 9
Message buffer 5
Message buffer 8
Message buffer 4
Message buffer 3
Message buffer 7
Message buffer 2
Message buffer 9
:
:
:
Receive history
list get pointer
(RGPT)
Receive history
list get pointer
(RGPT)
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