Renesas SH7641 - Manual (Page 520)

Section 15 User Debugging Interface (H-UDI)
Rev. 4.00 Sep. 14, 2005 Page 470 of 982
REJ09B0023-0400
TDO
(when the H-UDI
command is set)
TCK
TDO
(when the boundary scan
command is set)
t
TDOD
t
TDOD
Figure 15.3 H-UDI Data Transfer Timing
15.4.4 H-UDI Reset
An H-UDI reset is executed by inputting an H-UDI reset assert command in SDIR. An H-UDI
reset is of the same kind as a power-on reset. An H-UDI reset is released by inputting an H-UDI
reset negate command. The required time between the H-UDI reset assert command and H-UDI
reset negate command is the same as time for keeping the
RESETP pin low to apply a power-on
reset.
H-UDI reset assert H-UDI reset negate SDIR
Chip internal reset
CPU state Branch to H'A0000000
Figure 15.4 H-UDI Reset
15.4.5 H-UDI Interrupt
The H-UDI interrupt function generates an interrupt by setting a command from the H-UDI in the
SDIR. An H-UDI interrupt is a general exception/interrupt operation, resulting in a branch to an
address based on the VBR value plus offset, and with return by the RTE instruction. This interrupt
request has a fixed priority level of 15.
H-UDI interrupts are accepted in sleep mode.