M3850 RENESAS [Renesas Technology Corp], M3850 Datasheet - Page 8

• Manufacturer Part Number: M3850
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

Fig. 6 Register push and pop at interrupt generation and subroutine call
Table 4 Push and pop instructions of accumulator or processor status register
3850 Group (Spec.A)
Rev.2.10
REJ03B0093-0210
Accumulator
Processor status register
P u s h r e t u r n a d d r e s s
o n s t a c k
P O P r e t u r n
a d d r e s s f r o m s t a c k
2005.11.14
N o t e: C o n d i t i o n f o r a c c e p t a n c e o f a n i n t e r r u p t
page 8 of 86
M ( S )
( P C
M ( S )
( P C
E x e c u t e R T S
S u b r o u t i n e
I n t e r r u p t r e q u e s t
( S )
( S )
( S )
( S )
H
L
)
)
( S ) – 1
( S ) – 1
( S ) + 1
( S ) + 1
( P C
M ( S )
( P C
M ( S )
H
L
( N o t e )
)
)
O n - g o i n g R o u t i n e
E x e c u t e J S R
Push instruction to stack
PHA
PHP
I n t e r r u p t e n a b l e f l a g i s “ 1 ”
I n t e r r u p t d i s a b l e f l a g i s “ 0 ”
M ( S )
M ( S )
S e r v i c e R o u t i n e
M ( S )
( P C
( P C
( P S )
E x e c u t e R T I
( S )
( S )
( S )
( S )
( S )
( S )
I n t e r r u p t
H
L
)
)
( P S )
( S ) + 1
( S ) + 1
( S ) + 1
( S ) – 1
( P C
( S ) – 1
( S ) – 1
( P C
M ( S )
M ( S )
M ( S )
H
L
)
)
P u s h r e t u r n a d d r e s s
o n s t a c k
P u s h c o n t e n t s o f p r o c e s s o r
s t a t u s r e g i s t e r o n s t a c k
P O P c o n t e n t s o f
p r o c e s s o r s t a t u s
r e g i s t e r f r o m s t a c k
P O P r e t u r n
a d d r e s s
f r o m s t a c k
Pop instruction from stack
I F l a g i s s e t f r o m “ 0 ” t o “ 1 ”
F e t c h t h e j u m p v e c t o r
PLA
PLP