109
M37920F8CGP, M37920F8CHP, M37920FCCGP
M37920FCCHP, M37920FGCGP, M37920FGCHP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
MITSUBISHI MICROCOMPUTERS
Fig. 105 Microcomputer internal registers’ status just after reset (2)
(8016)
Address
CS0 control register L
(8116)
CS0 control register H
(8216)
CS1 control register L
(8316)
CS1 control register H
(8C16)
Area CS1 start address register
(8416)
CS2 control register L
(8516)
CS2 control register H
(8616)
CS3 control register L
(8716)
CS3 control register H
(8A16)
Area CS0 start address register
(DC16)
DMA1 mode register L
(DD16)
DMA1 mode register H
(DE16)
DMA1 control register
(EC16)
DMA2 mode register L
(ED16)
DMA2 mode register H
(8E16)
Area CS2 start address register
(9016)
Area CS3 start address register
Notes 1: The contents of the other registers and RAM are undefined at reset and must be initialized by software.
2: The status just after reset depends on the voltage level applied to pin MD0.
3: While Vss level voltage is applied to pin BYTE, these bits are “0”. While Vcc level voltage is applied to pin BYTE, on the other hand, these
bits are “1”.
0
000
0
(A816)
DRAM
control register
(B216)
DMA0 interrupt control register
0000
(B316)
DMA1 interrupt control register
0000
(B416)
DMA2 interrupt control register
(CC16)
DMA0 mode register L
000
(CE16)
DMA0 control register
(A016)
Real-time output control register
(AC16)
CTS/RTS separate select register
(B016)
DMAC control register L
0
00
0
00
0
(CD16)
DMA0 mode register H
(B516)
DMA3 interrupt control register
0
000
(EE16)
DMA2 control register
(FC16)
DMA3 mode register L
(FD16)
DMA3 mode register H
(FE16)
Address
DMA3 control register
0
00
0
00
0
00
0
10
(Note 2)
(Note 3)
10
0
100
0
(Note 3)
10
0
100
0
(Note 3)
10
0
100
0
(Note 3)
10
000
0000
0
00
0
00
0
000
0
00
0
00
0
00
0
0 0
000
0
001
0
000
0
000
0
000
0
000
0
000
0
000
0
000
0
000
0
000
0
00 0
0
00
0
00 0
0
00
0
00
000
0
00
0 0
0
000
0
0 0
0
001
0
000
0
000
0
000
0
000
0
000
0
000
(9E16)
Flash memory control register
0
0 0
001
0
00 0
00
(B116)
DMAC control register H
00
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 104 and 105 show the microcomputer internal register’s sta-
tus just after reset, and Figure 106 shows an operation example of
the reset circuit. Apply “L” level voltage to pin RESET for a period (2
s or more) under the following conditions:
Pin Vcc’s level satisfies the recommended operating condition.
Oscillator’s operation has been stabilized.
Fig. 106 Operation example of reset circuit (Note that proper evalu-
ation is necessary in the system development stage.)
VCC
RESET
Power on
VCC level
0.2VCC level
Oscillation stabilized
2
s
f(XIN)
0V