h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 120
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h8s-2158
Manufacturer Part Number
h8s-2158
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2158.pdf
(927 pages)
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Section 4 Exception Handling
4.3.1
When the RES 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
2. The reset exception handling vector address is read and transferred to the PC, and program
Figure 4.1 shows an example of the reset sequence.
Rev. 3.00 Jan 25, 2006 page 68 of 872
REJ09B0286-0300
and the I bit is set to 1 in CCR.
execution starts from the address indicated by the PC.
Reset Exception Handling
RES
Internal address bus
Internal read signal
Internal write signal
Internal data bus
(1) Reset exception handling vector address ((1) = H'0000)
(2) Start address (contents of reset exception handling vector address)
(3) Start address ((3) = (2))
(4) First program instruction
Figure 4.1 Reset Sequence (Mode 3)
Vector
fetch
(1)
(2)
processing
Internal
High
Prefetch of first program
instruction
(3)
(4)
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