m37702s1afp Mitsumi Electronics, Corp., m37702s1afp Datasheet - Page 37

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

RESET CIRCUIT
Reset occurs when the RESET pin is returned to “H” level after
holding it at “L” level when the power voltage is at 5 V ± 10%. Pro-
gram execution starts at the address formed by setting the
address pins A
FFFF
Figure 48 shows the status of the internal registers when a reset
occurs.
Figure 49 shows an example of a reset circuit. The reset input
voltage must be held 0.9 V or lower when the power voltage
reaches 4.5 V.
Fig. 48 Microcomputer internal status during reset
(1) Port P0 data direction register
(2) Port P1 data direction register
(3) Port P2 data direction register
(4) Port P3 data direction register
(5) Port P4 data direction register
(6) Port P5 data direction register
(7) Port P6 data direction register
(8) Port P7 data direction register
(9) Port P8 data direction register
(10) A-D control register
(11) A-D sweep pin selection register
(12) UART 0 transmit/receive mode
(13) UART 1 transmit/receive mode
(14) UART 0 transmit/receive
(15) UART 1 transmit/receive
(16) UART 0 transmit/receive
(17) UART 1 transmit/receive
(18) Count start flag
(19) One- shot start flag
(20) Up-down flag
(21) Timer A0 mode register
(22) Timer A1 mode register
(23) Timer A2 mode register
(24) Timer A3 mode register
(25) Timer A4 mode register
(26) Timer B0 mode register
(27) Timer B1 mode register
(28) Timer B2 mode register
16
, and A
register
register
control register 0
control register 0
control register 1
control register 1
7
23
– A
– A
0
16
to the contents of address FFFE
to 00
______
16
, A
15
Address
(04
(05
(08
(09
(0C
(0D
(10
(11
(14
(1E
(1F
(30
(38
(34
(3C
(35
(3D
(40
(42
(44
(56
(57
(58
(59
(5A
(5B
(5C
(5D
– A
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
8
16
16
16
16
16
16
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
to the contents of address
)
)
)
)
)
)
)
)
)
)
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
0 0
0 0
0 0
0 0 1
0 0 1
0 0 1
0 0
0 0
0 0
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
0 0 0
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
0 0 0 0
0
1 0
1 0
0 0
0 0
0 0
0 0
0 0
.
M37702M2AXXXFP, M37702M2BXXXFP
? ? ?
1 1
0 0
0 0
1 0
1 0
0
0
0
0
0
0
0
0
Contents of other registers and RAM are not initialized and should be initialized by software.
(31) Watchdog timer frequency selection
(32) A-D conversion interrupt control register
(33) UART 0 transmission interrupt control
(34) UART 0 receive interrupt control register
(35) UART 1 transmission interrupt control
(36) UART 1 receive interrupt control register
(37) Timer A0 interrupt control register
(38) Timer A1 interrupt control register
(39) Timer A2 interrupt control register
(40) Timer A3 interrupt control register
(41) Timer A4 interrupt control register
(42) Timer B0 interrupt control register
(43) Timer B1 interrupt control register
(44) Timer B2 interrupt control register
(45)
(46)
(47)
(48) Processor status register PS
(49) Program bank register PG
(50) Program counter PC
(51) Program counter PC
(52) Direct page register DPR
(53) Data bank register DT
(29) Processor mode register
(30) Watchdog timer
Fig. 49 Example of a reset circuit (perform careful evaluation
28
flag
INT
INT
INT
M37702S1AFP, M37702S1BFP
RESET
0
1
2
M37702M2AXXXFP
interrupt control register
interrupt control register
interrupt control register
at the system design level before using)
register
register
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
V
CC
H
L
69
MITSUBISHI MICROCOMPUTERS
(60
0V
0V
Address
(5E
(61
(70
(71
(72
(73
(74
(75
(76
(77
(78
(79
(7A
(7B
(7C
(7D
(7E
(7F
0
16
16
16
)
16
16
16
16
16
16
16
16
16
16
16
16
16
16
0
16
16
•••
)
)
)
)
)
)
)
)
)
)
)
)
)
•••
)
)
)
)
)
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
•••
0
?
Content of FFFF
Content of FFFE
?
0000
0
0
0
0
Power on
0.9V
4.5V
FFF
16
00
00
00
0
0
0
0
16
16
16
16
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0
0
0
0
0 0 0
0 0 0
0 0 0
1 ? ?
16
16
0 0
37