UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 442

• 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

442
(a) Read
(b) Write
(a) Read
(15) CAN module receive history list register (C0RGPT)
After reset: xx02H
Note The read value of RGPT0 to RGPT7 is invalid when RHPM = 1.
Note If ROVF is set, RHPM is no longer cleared on message storage, but RHPM is still set, if all
The C0RGPT register is used to read the receive history list.
ROVF
RHPM
RGPT7-RGPT0
C0RGPT
C0RGPT
Note
0
1
0
1
0 to 15
entries of C0RGPT are read by software.
The receive history list has at least one message buffer number that has not been read.
The receive history list has no message buffer numbers that has not been read.
All the message buffer numbers that have not been read are preserved. All the numbers of the
message buffer in which a new data frame or remote frame has been received and stored are
recorded to the receive history list (the receive history list has a vacant element).
All the message buffer numbers that are recorded are preserved except the message buffer number
recorded last
elements beside the last one are preserved. Message buffer number of subsequent data frame
storage or remote frame assignment is always logged in the RHL element LIPT pointer –1 is
pointing to. Note that the RHL will be updated, but the LIPT pointer will not be incremented.
Always the position the LIPT pointer –1 is pointing to is overwritten (the receive history list does not
have a vacant element).
RGPT7
15
15
7
0
0
7
0
When the C0RGPT register is read, the contents of the element indexed by the receive
history list get pointer (RGPT) of the receive history list are read.
indicate the number of the message buffer in which a data frame or a remote frame has
been stored.
Note
. The RHL is fully loaded with the unread message buffer number and all RHL
RGPT6
R/W
14
14
6
0
0
6
0
CHAPTER 16 CAN CONTROLLER
RGPT5
Address: FF60H, FF61H
13
13
User’s Manual U17554EJ4V0UD
5
0
0
5
0
Receive History List Pointer Match
Receive History List Overflow Bit
RGPT4
Receive History List Get Pointer
12
12
4
0
0
4
0
RGPT3
11
11
3
0
3
0
0
RGPT2
10
10
2
0
0
2
0
RGPT1
RHPM
9
1
9
0
1
0
RGPT0
ROVF
ROVF
Clear
8
0
8
0
0
These contents