m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 95

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

INTERRUPTS
6.7 Sequence from acceptance of interrupt request until execution of interrupt routine
Fig. 6.7.2 INTACK sequence timing (at minimum)
Table 6.7.1 Change in IPL at acceptance of interrupt request
6-14
Reset
Watchdog timer
Zero division
Address matching detection
Other interrupts
6.7.1 Change in IPL at acceptance of interrupt request
When an interrupt request is accepted, the processor interrupt priority level (IPL) is replaced with the
interrupt priority level of the accepted interrupt. This results in easy control of the processing for multiple
interrupts. (Refer to section “6.9 Multiple interrupts.”)
At acceptance of a watchdog timer interrupt request, a zero division request, or address matching detection
interrupt request or at reset, a value in Table 6.7.1 is set into the IPL.
AD
AD
DB
DB
23
15
15
7
BHW
–AD
–AD
–DB
–DB
BLW
RD
(Note)
(Note)
(Note)
(Note)
(Note)
(Note)
f
CPU
sys
When stack pointer (S)’s contents are even at acceptance of an interrupt request with bus cycle = 2
16
0
8
0
(Note)
(Note)
Note: These are internal signals and are not output to the external.
AD
DB
f
Interrupts
Undefined
Undefined
FFXX
sys
Undefined
Undefined
23
15
,
–AD
–DB
[S]: Contents of stack pointer (S)
CPU
16
0
0
: Vector address
: Internal clock (See Figure 4.3.1.)
: Internal address bus
: Internal data bus
0000
00
7905 Group User’s Manual Rev.1.0
IPL
Level 0 (“000
Level 7 (“111
Not changed.
Not changed.
Accepted interrupt’s priority level is set.
Vector address
(low-order)
INTACK sequence
00
[S]
PG
—
2
2
[S] – 2
”) is set.
”) is set.
00
PC
PC
H
L
Change in IPL
[S] – 4
00
PS
PS
H
L
FFXX
00
AD
AD
16
7
15
–AD
–AD
0
8
AD
Next instruction
Next instruction
15
00
–AD
0