Fujitsu FR81S Benutzerhandbuch
CHAPTER 13: EXTERNAL INTERRUPT INPUT
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : EXTERNAL INTERRUPT INPUT
FUJITSU SEMICONDUCTOR CONFIDENTIAL
9
4.3. External Interrupt Request Level Register 0/1 :
ELVR0/ELVR1 (External interrupt LeVel Register 0/1)
The bit configuration of external interrupt request level register 0/1 (ELVR0/ELVR1) is shown
below.
This register selects detection conditions for external interrupt requests.
ELVR0 : Address 0552
H
(Access: Byte, Half-word, Word)
ELVR1 : Address 0556
H
(Access: Byte, Half-word, Word)
bit15
bit14
bit13
bit12
bit11
bit10
bit9
bit8
LB7
LA7
LB6
LA6
LB5
LA5
LB4
LA4
Initial value
0
0
0
0
0
0
0
0
Attribute R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
LB3
LA3
LB2
LA2
LB1
LA1
LB0
LA0
Initial value
0
0
0
0
0
0
0
0
Attribute R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
[bit15 to bit1] LB7 to LB0 (Level select B) : Level select B
[bit14 to bit0] LA7 to LA0 (Level select A) : Level select A
[bit14 to bit0] LA7 to LA0 (Level select A) : Level select A
These bits select detection conditions for external interrupt requests. Combination of 2 bits, LA bit and LB bit
will be used.
LBn LAn
Detection conditions
0
0
"L" level detection(Initial value)
0
1
"H" level detection
1
0
Rising edge detection
1
1
Falling edge detection
When the request input is a level (LAn, LBn =00 or 01), the corresponding bit (ERn) will turn back to "1" if
INTn pin input is still in the effective levels after setting the external interrupt request bit (ERn) to "0".
⋅
ELVR0:LA/LB0 corresponds to INT0 pin, ELVR0:LA/LB1 to INT1 pin, ..., ELVR0:LA/LB7 to INT7
pin, ELVR1:LA/LB0 to INT8 pin, ..., ELVR1:LA/LB7 to INT15 pin.
⋅
The factor bit in the interrupt factor register may be set by changing the interrupt request level register.
Initialize the interrupt factor register after changing the interrupt request level register.
⋅
This register will be initialized by all reset factors except recovery from standby (power shutdown)
when PMUCTLR:IOCTMD=1.
MB91520 Series
MN705-00010-1v0-E
482