HD404339 Datasheet, PDF (11/78 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer with large-capacity memory

Table 1 Initial Values of Flags after MCU Reset
Item
Interrupt flags/mask
Bit registers
Interrupt enable flag (IE)
Interrupt request flag (IF)
Interrupt mask (IM)
Watchdog timer on flag (WDON)
A/D start flag (ADSF)
Input capture status flag (ICSF)
Input capture error flag (ICEF)
I_AD off flag (IAOF)
RAM enable flag (RAME)
Low speed on flag (LSON)
Direct transfer on flag (DTON)
HD404339 Series
Initial Value
0
0
1
0
0
0
0
0
0
0
0
RAM Address
$0000
Bit 3
IM0
(IM of INT₀)
$0001
IMTA
(IM of timer A)
$0002
IMTC
(IM of timer C)
$0003
IMS
(IM of serial)
Bit 2
IF0
(IF of INT₀)
IFTA
(IF of timer A)
IFTC
(IF of timer C)
IFS
(IF of serial)
Bit 1
RSP
(Reset SP bit)
IM1
(IM of INT₁)
IMTB
(IM of timer B)
IMAD
(IM of A/D)
Bit 0
IE
(Interrupt
enable flag)
IF1
(IF of INT₁)
IFTB
(IF of timer B)
IFAD
(IF of A/D)
Interrupt control bits area
$020
$021
IF: Interrupt
request flag
IM: Interrupt
$022
mask
IE: Interrupt
enable flag
$023
SP: Stack pointer
Bit 3
DTON
(Direct transfer
on flag)
RAME
(RAM enable
flag)
Bit 2
ADSF
(A/D start flag)
IAOF
(I_AD off flag)
Bit 1
WDON
(Watchdog
on flag)
ICEF
(Input capture
error flag)
Not used
Register flag area
Bit 0
LSON
(Low speed
on flag)
ICSF
(Input capture
status flag)
Figure 3 Interrupt Control Bits and Register Flag Areas Configuration
11