E62655RUSB Renesas Electronics America, E62655RUSB Datasheet - Page 116

• Manufacturer Part Number: E62655RUSB
• Description: EMULATOR BASE H8S/2655R W/USB
• Manufacturer: Renesas Electronics America
• Type: Microcontrollerr

Specifications of E62655RUSB

• Contents: E6000 Emulator Unit and 4 Logic Probes
• For Use With/related Products: H8S/2655R
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Section 4 Exception Handling
4.2.4
If an interrupt is accepted after a reset but before the stack pointer (SP) is initialized, the PC and
CCR will not be saved correctly, leading to a program crash. To prevent this, all interrupt requests,
including NMI, are disabled immediately after a reset. Since the first instruction of a program is
always executed immediately after the reset state ends, make sure that this instruction initializes
the stack pointer (example: MOV.L #xx:32, SP).
Rev. 5.00 Sep 14, 2006 page 86 of 1060
REJ09B0331-0500
RES
Address bus
RD
HWR, LWR
D
(1) (3) Reset exception handling vector address ((1) = H'000000, (3) = H'000002)
(2) (4) Start address (contents of reset exception handling vector address)
(5)
(6)
Note: * 3 program wait states are inserted.
15
Interrupts after Reset
to D
Start address ((5) = (2) (4))
First program instruction
0
Figure 4.3 Reset Sequence (Mode 4)
*
(1)
Vector fetch
(2)
High
*
(3)
Internal
processing
(4)
Prefetch of first
program instruction
(5)
*
(6)