UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 444

• 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

444
(a) Read
(b) Write
(a) Read
(17) CAN module transmit history list register (C0TGPT)
Note The read value of TGPT0 to TGPT7 is invalid when THPM = 1.
Note If TOVF is set, THPM is no longer cleared on message transmission, but THPM is still set,
Remark Transmission from message buffer 0 to 7 is not recorded to the transmit history list in
After reset: xx02H
The C0TGPT register is used to read the transmit history list.
TGPT7-TGPT0
C0TGPT
C0TGPT
THPM
0 to 15
TOVF
if all entries of C0TGPT are read by software.
0
1
0
1
the normal operation mode with ABT.
Note
TGPT7
15
15
7
0
0
7
0
When the C0TGPT register is read, the contents of the element indexed by the read
pointer (TGPT) of the transmit history list are read. These contents indicate the number
of the message buffer to which a data frame or a remote frame was transmitted last.
All the message buffer numbers that have not been read are preserved. All the numbers
of the message buffers to which a new data frame or remote frame has been transmitted
are recorded to the transmit history list (the transmit history list has a vacant element).
At least 7 entries have been stored since the host processor has serviced the THL last
time (i.e. read CnTGPT). The first 6 entries are sequentially stored while the last entry
can have been overwritten whenever a message is newly transmitted because all buffer
numbers are stored at position LOPT-1 when TOVF bit is set. Thus the sequence of
transmissions can not be recovered completely now.
The transmit history list has at least one message buffer number that has not been read.
The transmit history list has no message buffer number that has not been read.
R/W
TGPT6
14
14
6
0
0
6
0
CHAPTER 16 CAN CONTROLLER
Address: FF62H, FF63H
TGPT5
13
13
User’s Manual U17554EJ4V0UD
5
0
0
5
0
Transmit History List Read Pointer
Transmit History List Overflow Bit
TGPT4
Transmit History Pointer Match
12
12
4
0
0
4
0
TGPT3
11
11
3
0
0
3
0
TGPT2
10
10
2
0
0
2
0
TGPT1
THPM
9
1
9
0
1
0
TGPT0
TOVF
TOVF
Clear
8
0
8
0
0