78
M37905M4C-XXXFP, M37905M4C-XXXSP
M37905M6C-XXXFP, M37905M6C-XXXSP
M37905M8C-XXXFP, M37905M8C-XXXSP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Som
e param
etric
lim
its are
subject
to change.
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig. 88 Microcomputer internal register’s status at reset (2)
RESET CIRCUIT
While the power source voltage satisfies the recommended operat-
ing condition, reset state is removed if pin RESET’s level returns
from the stabilized “L” level to the “H” level. As a result, program ex-
ecution starts from the reset vector address. This reset vector ad-
dress is expressed as shown below:
A23 to A16 = 0016
A15 to A8 = Contents at address FFFF16
A7 to A0 = Contents at address FFFE16
Figures 87 and 88 show the microcomputer internal register’s status
at reset, and Figure 89 shows an operation example of the reset cir-
cuit. Apply “L” level voltage to pin RESET for a period (10 s or more)
under the following conditions:
Pin Vcc’s level satisfies the recommended operating condition.
Oscillator’s operation has been stabilized.
Fig. 89 Operation example of reset circuit (Note that proper evalua-
tion is necessary in the system development stage.)
(DB16)
(A616)
(A816)
(A916)
(AA16)
(D716)
(AC16)
(AE16)
(C416)
(D616)
(D816)
(D916)
(DA16)
00 0
0016
000016
FFF16
1??
0
00
? ?
0
0 0
0000
(F516)
(F616)
(F716)
0
00
0 0 0
(F916)
000
(FE16)
0
00
0 0 0
(FD16)
(F816)
(FF16)
0
00
0016
000 0
0016
(A016)
(A216)
(A416)
0016
0 0
1
0
00 0 0
(B416)
0
000
00 1 0
(B516)
(B016)
0016
0 0
0
001
01 1 1
(BC16)
00 0
(DD16)
(DE16)
0016
(DC16)
0016
(DF16)
0016
0000
(F116)
(F216)
Waveform output mode register
Three-phase output data register 0
Three-phase output data register 1
Pulse output control register
Pulse output data register 0
Pulse output data register 1
UART2 transmit/receive mode register
UART2 transmit/receive control register 0
UART2 transmit/receive control register 1
UART2 transmit interrupt control register
UART2 receuve interrupt control register
Position-data-retain function control register
Serial I/O pin control register
Port P2 pin function control register
Note: The contents of the other registers and RAM are undefined at reset and must be initialized by software.
Timer A6 mode register
Clock control register 0
A-D control register 2
Up-down register 1
Timer A5 mode register
Timer A7 mode register
Timer A8 mode register
Timer A9 mode register
Address
Contents at address FFFF16
Contents at address FFFE16
Program bank register PG
Program counter PCH
Program counter PCL
Direct page registers DPR0 to DPR3
Data bank register DT
Stack pointer
Processor status register PS
INT7 interrupt control register
Timer A5 interrupt control register
Timer A6 interrupt control register
Timer A7 interrupt control register
Timer A9 interrupt control register
INT6 interrupt control register
INT5 interrupt control register
Timer A8 interrupt control register
Comparator function select register 0
Comparator function select register 1
Comparator result register 0
Comparator result register 1
VCC
RESET
Power on
VCC level
0.2VCC level
Oscillation stabilized
10
s
XIN
0V