3. Exception Handling
Rev.3.00 Jul. 19, 2007 page 89 of 532
REJ09B0397-0300
3.3.6 Interrupt
Response Time
Table 3.4 shows the number of wait states after an interrupt request flag is set until the first
instruction of the interrupt handler is executed.
Table 3.4
Interrupt Wait States
Item States
Waiting time for completion of executing instruction
*
1 to 13
Saving of PC and CCR to stack
4
Vector fetch
2
Instruction fetch
4
Internal processing
4
Total
15 to 27
Note:
*
Not including EEPMOV instruction.
3.4 Application
Notes
3.4.1
Notes on Stack Area Use
When word data is accessed in the H8/3857 Group, the least significant bit of the address is
regarded as 0. Access to the stack always takes place in word size, so the stack pointer (SP: R7)
should never indicate an odd address. Use PUSH Rn (MOV.W Rn, @–SP) or POP Rn (MOV.W
@SP+, Rn) to save or restore register values.
Setting an odd address in SP may cause a program to crash. An example is shown in figure 3.6.
Summary of Contents for F-ZTAT H8 Series
Page 6: ...Rev 3 00 Jul 19 2007 page iv of xxiv REJ09B0397 0300...
Page 194: ...7 RAM Rev 3 00 Jul 19 2007 page 168 of 532 REJ09B0397 0300...
Page 234: ...8 I O Ports Rev 3 00 Jul 19 2007 page 208 of 532 REJ09B0397 0300...
Page 274: ...9 Timers Rev 3 00 Jul 19 2007 page 248 of 532 REJ09B0397 0300...
Page 352: ...12 A D Converter Rev 3 00 Jul 19 2007 page 326 of 532 REJ09B0397 0300...
Page 561: ......
