UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 607

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

20.11.1 Interrupt Acknowledge Processing Time
elapsed, execution of the interrupt processing program is started.
Vector Table
Branch
Destination
Stack
Vectored
Interrupts
Context
Switching
The time shown in Table 20-7 is requered to acknowledge an interrupt request. After the time shown in theis table has
Remarks 1. IROM : internal ROM (with high-speed fetch specified)
2. n is the number of wait states per byte necessary for writing data to the stack (the number of wait states
3. If the vector table is EMEM, and if wait states are inserted in reading the vector table, add 2 m to the value
4. If the branch destination is EMEM and if wait states are inserted in reading the instruction at the branch
5. If the stack is occupied by PRAM and if the value of the stack pointer (SP) is odd, add 4 to the value in
6. The number of wait states is the sum of the number of address wait states and the number of access wait
IRAM
PRAM : peripheral RAM of internal RAM (only when LOCATION 0 instruction is executed in the case
IRAM : internal high-speed RAM
EMEM : internal ROM when external memory and high-speed fetch are not specified
is the sum of the number of address wait states and the number of access wait states).
of the vectored interrupt in the above table, and add m to the value of context switching, where m is the
number of wait states per byte necessary for reading the vector table.
destination, add that number of wait states.
the above table.
states.
22
26
IROM, PRAM
PRAM
29
of branch destination)
–
Table 20-7 Interrupt Acknowledge Processing Time
37 + 4n
EMEM
–
IROM
CHAPTER 20 INTERRUPT FUNCTIONS
IRAM
27
23
EMEM
PRAM
30
–
38 + 4n
EMEM
–
IRAM
30
22
PRAM
PRAM
33
–
41 + 4n
EMEM
–
EMEM
IRAM
23
31
(Unit: Clock = 1/f
EMEM
PRAM
34
–
42 + 4n
EMEM
–
567
CLK
)