UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 462

• 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

16.9.4 Mask function
mask) can be selected.
reception of several different IDs into one buffer.
not compared with the corresponding identifier bit in the message buffer.
and bits ID24 and ID22 are "1", are to be stored in message buffer 14. The procedure for this example is shown
below.
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For any message buffer, which is used for reception, the assignment to one of four global reception masks (or no
By using the mask function, the message ID comparison can be reduced by masked bits, herewith allowing the
While the mask function is in effect, an identifier bit that is defined to be "1" by a mask in the received message is
However, this comparison is performed for any bit whose value is defined as "0" by the mask.
For example, let us assume that all messages that have a standard-format ID, in which bits ID27 to ID25 are "0"
ID with ID27 to ID25 cleared to "0" and ID24 and ID22 set to "1" is registered (initialized) to message buffer 14.
<1> Identifier to be stored in message buffer
<2> Identifier to be configured in message buffer 14 (example)
Remark
(using CANn message ID registers L14 and H14 (C0MIDL14 and C0MIDH14))
ID28
ID28
ID17
ID6
x
x
x
x
x = don’t care
Message buffer 14 is set as a standard format identifier that is linked to mask 1 (MT[2:0] of
C0MCONF14 register are set to 010B).
ID27
ID27
ID16
ID5
0
0
x
x
ID26
ID26
ID15
ID4
0
0
x
x
ID25
ID25
ID14
ID3
0
0
x
x
CHAPTER 16 CAN CONTROLLER
User’s Manual U17554EJ4V0UD
ID24
ID24
ID13
ID2
1
1
x
x
ID23
ID23
ID12
ID1
x
x
x
x
ID22
ID22
ID11
ID0
1
1
x
x
ID21
ID21
ID10
x
x
x
ID20
ID20
ID9
x
x
x
ID19
ID19
ID8
x
x
x
ID18
ID18
ID7
x
x
x