Rev. 1.0, 09/01, page 65 of 904
Vector Address
*
1
Exception Source
Vector Number
Normal Mode
*
2
Advanced Mode
Internal interrupt
*
4
32
118
H'0040 to H'0041
H'00EC to H'00ED
H'0080 to H'0083
H'01D8 to H'01DB
Notes: 1. Lower 16 bits of the address.
2. Not available in this LSI.
3. Not available in this LSI. It is reserved for system use.
4. For details of internal interrupt vectors, see section 5.5, Interrupt Exception Handling
Vector Table.
4.3
Reset
A reset has the highest exception priority. When the
5(6
pin goes low, all processing halts and
this LSI enters the reset. To ensure that this LSI is reset, hold the
5(6
pin low for at least 20 ms at
power-up. To reset the chip during operation, hold the
5(6
pin low for at least 20 states. A reset
initializes the internal state of the CPU and the registers of on-chip supporting modules.
The chip can also be reset by overflow of the watchdog timer. For details see section 14,
Watchdog Timer.
The interrupt control mode is 0 immediately after reset.
4.3.1
Reset exception handling
When the
5(6
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 supporting 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.
Содержание H8S/2376 F-ZTAT
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