Transmission/Reception Of J0/J1 Trace Message; Transmitting Trace Message - NEC UPD98413 User Manual

3.6 Transmission/Reception of J0/J1 Trace Message

The J0 byte of SOH and J1 byte of POH are used to transfer 16-byte or 64-byte trace messages. µ PD98413 has
a function for transmitting or receiving these trace messages.
J0: Section trace message
J1: Path trace message

3.6.1 Transmitting Trace Message

The µ PD98413 has a message buffers for each of J0 and J1 to set trace messages. A new message is set to
Expected buffer; a trace message is transmitted from buffer.
Table 3-19 Register and bits related trace message transmit
Classificati Register and Bit of Section trace
on message
Section (J0)
Mode MDSOHT
register
J0SZ bit
Buffer BSEL bit
select
BADR bits
TMBT
register
Buffer BDAT bit
Access
register
TMDT
register
Transmit J0STAT bit
command
CMTMT
register
100
CHAPTER 3 FUNCTIONAL OUTLINE
R/W
Path (J1)
MDPOHT R/W
register
J1SZ bit
BSEL bit R/W
BADR bits R/W
BDAT bit R/W
J1STAT bit R/W
PRELIMINARY
Outline
Selection of 16- or 64-byte length
Selection of J0 buffer or J1 buffer
Set the offset address of the trace message buffer
Access to Accepted buffer,
Start to transmit new trace massage.
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