SH7058 Datasheet, PDF (578/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

Timestamp Fields:
Records the timestamp on messages for transmission/reception. The timestamp will be a useful
function to monitor if messages are received/transmitted within expected schedule or if messages
for transmission are scheduled in the appropriate order.
Register Name
MBx[6]*
Address
Bit Bit Name
H'106 + N × 32 15 TimeStamp
to 0 [15:0]
Note: * x/N: 0 to 31 (Indicates the mailbox number)
Description
Message Reception:
During message reception, when the
SOF or EOF is detected, ICR1 (input
capture register 1) always captures the
TCNTR (timer counter register) value or
the value of Cycle_Counter +
TCNTR[15:4], depending on the value of
bit 3 in TMR (Timer mode register), at
either SOF or EOF depending on the
value in TCR13 (timer control register),
and the ICR1 value is stored into the
timestamp field of the corresponding
mailbox.
Important: Capturing at the SOF is not
supported by the SH7058. Thus TCR13
should be set to EOF detection mode.
Message Transmission:
During message transmission, the
TCNTR (timer counter register) value or
the value of Cycle_Counter +
TCNTR[15:4], depending on the value of
bit 3 in TMR (timer mode register) is
captured when either the TXPR bit or
TXACK bit is set depending on the value
in TCR12, and the captured value is
stored into the timestamp field of the
corresponding mailbox.
Important: Capturing when the TXPR bit
is set is not supported by the SH7058.
Activation of the TCNR (timer) causes a
problem in the SH7058 (timer usage is
prohibited). Therefore, the timestamp
function is not supported.
The write value should be 0. The value
read as the initial value is not
guaranteed.
Rev. 3.0, 09/04, page 537 of 1086