Mcu External Interrupt; External Interrupt Configuration Registers - Fujitsu MB88121 Application Note

•
Error Interrupt Enable Set / Reset (EIES, EIER): Enable / disable error interrupts
•
Status Interrupt Enable Set / Reset (SIES, SIER) : Enable / disable status interrupts
•
Interrupt Line Enable (ILE): Enable interrupt lines

3.2.2 MCU external interrupt

Following show the setup and usage of the external interrupt (rising edge) for MB88121
connection.
Following registers are relevant for external interrupt:
•
ELVR: interrupt request level register
•
EIRR: interrupt request register
•
ENIR: interrupt request enable register
•
DDR: data direction register
•
PFR: port function register
•
ICR: interrupt control register

3.2.2.1 External interrupt configuration registers

Register ELVR, EIRR and ENIR specify the external interrupt function. ELVR defines how to
detect interrupt request signal. EIRR shows if an external interrupt request is detected. ENIR
enables/disables interrupt request.
register address
EIRR0 0x30 ER7
ENIR0 0x31 EN7
0x32
LB7
ELVR0
0x33
LB3
register address
EIRR1 0x34
ENIR1 0x35
0x36
ELVR1
0x37
© Fujitsu Microelectronics Europe GmbH
Interfacing MB91460 TO MB88121
Chapter 3 Software
External interrupt 0-7
7 6 5
ER6 ER5
EN6 EN5
15 14 13
LA7 LB6
7 6 5
LA3 LB2
External interrupt 8-14
7 6 5
\ ER14 ER13
\ EN14 EN13
15 14 13
\ \ LB14
7 6 5
\ \ LB10
Table 3-13 EIRR, ENIR ELVR overview
Bit value
4 3
ER4 ER3
EN4 EN3
12 11
LA6 LB5
4 3
LA2 LB1
Bit value
4 3
ER12 \
EN12 \
12 11
LA14 LB13
4 3
LA10 LB9
- 37 -
2 1 0
ER2 ER1 ER0
EN2 EN1 EN0
10 9 8
LA5 LB4 LA4
2 1 0
LA1 LB0 LA0
2 1 0
ER10 ER9 ER8
EN10 EN9 EN8
10 9 8
LA13 LB12 LA12
2 1 0
LA9 LB8 LA8
MCU-AN-300016-E-V10