m37702s1afp Mitsumi Electronics, Corp., m37702s1afp Datasheet - Page 14

• Manufacturer Part Number: m37702s1afp
• Description: Single-chip 16-bit Cmos Microcomputer
• Manufacturer: Mitsumi Electronics, Corp.

As shown in Figure 9, there are three different interrupt priority
resolution time from which one is selected by software. After the
selected time has elapsed, the highest priority is determined and
is processed after the currently executing instruction has been
completed.
The time is selected with bits 4 and 5 of the processor mode reg-
ister (address 5E
relationship between these bits and the number of cycles. After a
reset, the processor mode register is initialized to “00
therefore, the longest time is selected.
However, the shortest time should be selected by software.
Fig. 9 Interrupt priority resolution time
Fig. 10 Processor mode register configuration
14
16
Internal clock
Operation code fetch cycle
Sampling pulse
Priority resolution time
Select from 0 to 2 with bits
4 and 5 of the processor
mode register
) shown in Figure 10. Table 4 shows the
7
6
0
5
4
3
0
1
2
2
1
M37702M2AXXXFP, M37702M2BXXXFP
16
0
” and
Processor mode register (5E
Processor mode bits
Wait bit
Software reset bit
Priority resolution time selection bits
Test mode bit
Clock
0 0 : Single-chip mode
0 1 : Memory expansion mode
1 0 : Microprocessor mode
1 1 : Evaluation chip mode
The processor is reset when this bit is set to “1” .
0 0 : Select 0 in Figure 9
0 1 : Select 1 in Figure 9
1 0 : Select 2 in Figure 9
Must be “0”
0 : No
1 :
0 : Wait
1 : No wait
Table 3. Value set in processor interrupt level (IPL) during an
Table 4. Relationship between priority level resolution time
1
1
Reset
____
DBC
Watchdog timer
Zero divide
BRK instruction
output
: internal clock
output selection bit
Priority level resolution time selection bit
M37702S1AFP, M37702S1BFP
1
output
Interrupt types
Bit 5
interrupt
selection bit and number of cycles
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
0
0
1
16
MITSUBISHI MICROCOMPUTERS
)
Bit 4
0
1
0
Not change value of IPL.
Not change value of IPL.
Setting value
0
7
7
Number of cycles
7 cycles of
4 cycles of
2 cycles of