M37220M3-010SP MITSUBISHI [Mitsubishi Electric Semiconductor], M37220M3-010SP Datasheet - Page 39

• Manufacturer Part Number: M37220M3-010SP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER?
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

RESET CIRCUIT
The M37220M3-XXXSP is reset according to the sequence shown
in Figure 41. It starts the program from the address formed by using
the content of address FFFF
content of the address FFFE
RESET pin is held at “L” level for 2 s or more while the power source
voltage is 5 V ± 10 % and the oscillation of a quartz-crystal oscillator
Fig. 41. Reset sequence
X
RESET
Internal RESET
SYNC
Address
Data
IN
clock cycle (Note 3)
32768 count of X
16
16
as the low-order address, when the
as the high-order address and the
?
IN
?
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
?
?
01, S
?
01, S-1 01, S-2
Notes 1 : f(X
?
Fig. 42. Example of reset circuit
or a ceramic resonator is stable and then returned to “H” level. The
internal state of microcomputer at reset are shown in Figure 43.
An example of the reset circuit is shown in Figure 42.
The reset input voltage must be kept 0.6 V or less until the power
source voltage surpasses 4.5 V.
2 : A question mark (?) indicates an undefined state that
3 :
?
Power source voltage 0 V
Immediately after a reset, timer 3 and timer 4 are
depends on the previous state.
connected in hardware. At this time, “FF
in timer 3 and “07
with f(X
overflow signal.
Reset input voltage 0 V
FFFE
IN
AD
) and f( ) are in the relation : f(X
IN
L
FFFF
)/16, and reset state is released by the timer 4
AD
with ON-SCREEN DISPLAY CONTROLLER
H
AD
AD
16
H
L
,
MITSUBISHI MICROCOMPUTERS
” is set to timer 4. Timer 3 counts down
M51953AL
1
3
M37220M3-XXXSP
Reset address from the vector table
5
4
0.1 F
Poweron
IN
) = 2·f ( ).
M37220M3-XXXSP
16
22
25
21
0.6 V
4.5 V
” is set
RESET
Vcc
Vss
39