M37735S4BFP Datasheet, PDF (15/36 Pages) Mitsubishi Electric Semiconductor – 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
M37735S4BFP
16-BIT CMOS MICROCOMPUTER
RESET CIRCUIT
_____
The microcomputer is released from the reset state when the RESET
pin is returned to “H” level after holding it at “L” level with the power
source voltage at 5 V ± 10%. Program execution starts at the address
formed by setting address A23 – A16 to 0016, A15 – A8 to the contents
of address FFFF16, and A7 – A0 to the contents of address FFFE16.
Figure 13 shows an example of a reset circuit. If the stabilized clock
is input from the external to the main-clock oscillation circuit, the reset
input voltage must be 0.9 V or less when the power source voltage
reaches 4.5 V. If a resonator/oscillator is connected to the main-clock
oscillation circuit, change the reset input voltage from “L” to “H” after
the main-clock oscillation is fully stabilized.
Figure 12 shows the status of the internal registers during reset.
Address
Port P0 direction register
(0416)•••
0016
Port P1 direction register
(0516)•••
0016
Port P2 direction register
(0816)•••
0016
Port P3 direction register
(0916)•••
000 0
Port P4 direction register
(0C16)•••
0016
Port P5 direction register
(0D16)•••
0016
Port P6 direction register
(1016)•••
0016
Port P7 direction register
(1116)•••
0016
Port P8 direction register
(1416)•••
0016
A-D control register 0
(1E16)••• 0 0 0 0 0 ? ? ?
A-D control register 1
(1F16)•••
0 00 11
UART 0 transmit/receive mode register (3016)•••
0016
UART 1 transmit/receive mode register ^{(3816)•••}
0016
UART 0 transmit/receive
control register 0
UART 1 transmit/receive
control register 0
UART 0 transmit/receive
control register 1
UART 1 transmit/receive
control register 1
Count start flag
(3416)••• 0 0 0 0 1 0 0 0
(3C16)••• 0 0 0 0 1 0 0 0
(3516)••• 0 0 0 0 0 0 1 0
(3D16)••• 0 0 0 0 0 0 1 0
(4016)•••
0016
One- shot start flag
(4216)•••
00000
Up-down flag
(4416)•••
0016
Timer A0 mode register
(5616)•••
0016
Timer A1 mode register
(5716)•••
0016
Timer A2 mode register
Timer A3 mode register
Timer A4 mode register
(5816)•••
(5916)•••
(5A16)•••
0016
0016
0016
Timer B0 mode register
(5B16)••• 0 0 1 0 0 0 0 0
Timer B1 mode register
(5C16)••• 0 0 1 0 0 0 0
Timer B2 mode register
(5D16)••• 0 0 1 0 0 0 0
Processor mode register 0
(5E16)•••
0016
Processor mode register 1
(5F16)•••
0
Watchdog timer register
(6016)•••
FFF16
Address
Watchdog timer frequency selection flag
Waveform output mode register
(6116)•••
(6216)••• 0
000
0
00
UART2 transmit/receive mode register
(6416)••• 0 0 0 0 0 0 0
UART2 transmit/receive control register 0
(6816)•••
10 00
UART2 transmit/receive control register 1
(6916)••• 0 0 0 0 0 0 1 0
Oscillation circuit control register 0
(6C16)••• 0 0 0 0 0 1
Port function control register
(6D16)•••
0016
Serial transmit control register
(6E16)•••
00
Oscillation circuit control register 1
(6F16)••• 0
00 000
A-D/UART2 trans./rece. interrupt control register (7016)•••
0 000
UART 0 transmission interrupt control register (7116)•••
0 000
UART 0 receive interruupt control register
(7216)•••
0 000
UART 1 transmission interrupt control register (7316)•••
0 000
UART 1 receive interruupt control register
(7416)•••
0 000
Timer A0 interrupt control register
(7516)•••
0 000
Timer A1 interrupt control register
(7616)•••
0 000
Timer A2 interrupt control register
(7716)•••
0 000
Timer A3 interrupt control register
(7816)•••
0 000
Timer A4 interrupt control register
(7916)•••
0 000
Timer B0 interrupt control register
(7A16)•••
0 000
Timer B1 interrupt control register
(7B16)•••
0 000
Timer B2 interrupt control register
(7C16)•••
0 000
INT0 interrupt control register
(7D16)•••
000 000
INT1 interrupt control register
(7E16)•••
000 000
INT2/key input interrupt control register
(7F16)•••
000 0 00
Processor status register (PS)
0 00? ?000 1? ?
Program bank register (PG)
0016
Program counter (PCH)
Content of FFFF16
Program counter (PCL)
Direct page register (DPR)
Content of FFFE16
000016
Data bank register (DT)
0016
Contents of other registers and RAM are undefined during reset. Initialize them by software.
Fig. 12 Microcomputer internal status during reset
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