Rev. 3.0, 10/02, page 68 of 686
4.3.2
Reset Exception Handling
When the
RES
or
MRES
pin goes high after being held low for the necessary time, this LSI starts
reset exception handling as follows:
1. The internal state of the CPU and the registers of the on-chip peripheral modules are initialized,
the T bit is cleared to 0 in EXR, and the I bit is set to 1 in EXR and CCR.
2. The reset exception handling vector address is read and transferred to the PC, and program
execution starts from the address indicated by the PC.
Figures 4.1 and 4.2 show examples of the reset sequence.
(1)
(2)
(3)
(4)
: Reset exception handling vector address (for a power-on reset, (1) = H'000000
for a manual reset, (1) = H'000002)
: Start address (contents of reset exceptiion handling vector address)
: Start address ((3) = (2))
: First program instruction
φ
,
Address bus
,
D15 to D0
Vector
fetch
(1)
(3)
High
Internal
processing
Prefetch of first program
instruction
(4)
(2)
Figure 4.1 Reset Sequence (Modes 2 and 3: Not available in this LSI)
Summary of Contents for H8S/2215 Series
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