HD404374 Datasheet, PDF (39/161 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip A/D Converter

HD404374/HD404384/HD404389/HD404082/HD404084 Series
Interrupt enable flag (IE: $000,0):
The interrupt enable flag controls interrupt enabling/disabling of all interrupt requests as shown in table 4.
The interrupt enable flag is reset by interrupt handling and set by the RTNI instruction.
Table 4 Interrupt Enable Flag (IE: $000,0)
Interrupt Enable Flag (IE)
0
1
Interrupt Enabling/Disabling
Interrupts disabled
Interrupts enabled
Wakeup interrupt request flag (IFWU: $000,2):
The wakeup interrupt request flag (IFWU) is set by the detection of a falling edge in WU₀ input in active
mode, subactive mode,watch mode, or standby mode. In stop mode, when a falling edge is detected at the
wakeup pin, the MCU waits for the oscillation settling time, then switches to active mode. When a
transition is made from stop mode to active mode with IE set to 1 and IMWU cleared to 0, wakeup
interrupt handling is executed after the switch to active mode. The wakeup interrupt request flag (IFWU) is
not set in this case (table 5).
Table 5 Wakeup Interrupt Request Flag (IFWU: $000,2)
Wakeup Interrupt Request Flag
(IFWU)
0
1
Interrupt Request
No wakeup interrupt request
Wakeup interrupt request generated
Wakeup Interrupt Mask (IMWU: $000,3):
his bit masks an interrupt request by the wakeup interrupt request flag (table 6).
Table 6 Wakeup Interrupt Request Mask (IMWU: $000,3)
Wakeup Interrupt Mask (IMWU)
0
1
Interrupt Request
Wakeup interrupt request enabled
Wakeup interrupt request masked (held pending)
External interrupt request flag (IF0: $001, 0):
The
external
interrupt
request
flag
is
set
by
an
INT
0
input
falling
edge
(table
7).
Table 7 External Interrupt Request Flag (IF0: $001, 0)
External Interrupt Request Flag
(IF0)
0
1
Interrupt Request
No external interrupt request
External interrupt request generated
Rev.5.00, Sep.11.2003, page 39 of 161