M30280F6HP RENESAS [Renesas Technology Corp], M30280F6HP Datasheet - Page 99

• Manufacturer Part Number: M30280F6HP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

M
R
R
e
E
1
. v
Figure 9.8 Operation of Saving Register
J
6
0
C
2
9
2 /
The operation of saving registers carried out in the interrupt sequence is dependent on whether the SP
at the time of acceptance of an interrupt request, is even or odd. If the stack pointer
register and the PC are saved, 16 bits at a time. If odd, they are saved in two steps, 8 bits at a time.
Figure 9.8 shows the operation of the saving registers.
NOTES:
0 .
B
0
0
8
0
1. When any INT instruction in software numbers 32 to 63 has been executed, this is the SP indicated
G
4
J
7
a
o r
by the U flag. Otherwise, it is the ISP.
0 -
. n
u
2
3
p
0
, 1
0
(
M
2
NOTES:
0
1
[SP] – 5 (Odd)
[SP] – 4 (Even)
[SP] – 2 (Even)
(2) SP contains odd number
[SP] – 5 (Even)
[SP] – 3 (Even)
[SP] – 1 (Even)
(1) SP contains even number
[SP] – 3(Odd)
[SP] – 1(Odd)
[SP]
[SP] – 4(Odd)
[SP] – 2(Odd)
[SP]
0
6
7
1. [SP] denotes the initial value of the SP when interrupt request is acknowledged.
C
After registers are saved, the SP content is [SP] minus 4.
2 /
Address
Address
, 8
(Odd)
page 79
(Even)
M
1
6
C
2 /
f o
8
3
) B
FLG
FLG
8
5
Stack
Stack
H
H
FLG
FLG
PC
PC
PC
PC
M
M
L
L
L
L
PC
PC
H
H
Sequence in which order
registers are saved
Sequence in which order
registers are saved
Finished saving registers
in two operations.
(3)
(4)
(1)
(2)
(2) Saved simultaneously,
(1) Saved simultaneously,
Finished saving registers
in four operations.
all 16 bits
all 16 bits
Saved, 8 bits at a time
(1)
is even, the FLG
9. Interrupts
(1)
,