M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 82

• Manufacturer Part Number: M38867E8AHP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER??
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

The operation procedure in CPU reprogramming mode is de-
scribed below.
Note: The following are necessary other than this:
Fig. 80 Flash command register bit configuration
82
< Beginning procedure >
After CPU reprogramming mode control program is transferred to
mand-writing to the flash command register .
Apply 0 V to the CNVss/V
Set “1" to the CPU reprogramming mode select bit.
Apply V
Wait till CNV
The operation of the flash memory is executed by software-com-
CPU reprogramming mode operation procedure
whether the CPU reprogramming mode is valid.
Read the CPU reprogramming mode monitor flag to confirm
internal RAM, jump to this control program on RAM. (The follow-
ing operations are controlled by this control program).
Note: The flash command register is write-only register.
7
•Control for data which is input from the external (serial I/O
•Initial setting for ports etc.
•Writing to the watchdog timer
etc.) and to be programmed to the flash memory
6
PP
H to the CNV
5
SS
4
/V
<Software command name>
• Read command
• Program command
• Program verify command
• Erase command
• Erase verify command
• Reset command
PP
3
pin becomes 12 V.
2
SS
1
PP
/V
PP
0
pin for reset release.
pin.
Writing of software command
Flash command register
(FCMD : address 0FFF
<Command code>
“00
“40
“C0
“20
“A0
“FF
16
16
16
16
16
16
”
”
” + “20
”
” + “FF
”
16
)
16
16
”
”
When “00
M38869FFAHP/GP enters the read mode. The contents of the
corresponding address can be read by reading the flash memory
(For instance, with the LDA instruction etc.) under this condition.
The read mode is maintained until another command code is written
to the flash command register. Accordingly, after setting the read
mode once, the contents of the flash memory can continuously be
read.
After reset and after the reset command is executed, the read
mode is set.
Fig. 81 CPU mode register bit configuration in CPU rewriting
< Release procedure >
Each software command is explained as follows.
Apply 0V to the CNV
Wait till CNV
Set the CPU reprogramming mode select bit to “0.”
Read command
b 7
mode
16
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
" is written to the flash command register, the
SS
/V
PP
MITSUBISHI MICROCOMPUTERS
SS
pin becomes 0V.
/V
0
PP
pin.
b 0
0
C P U m o d e r e g i s t e r
(
C P U M : a d d r e s s
P r o c e s s o r m o d e b i t s
S t a c k p a g e s e l e c t i o n b i t
R e s e r v e d
( D o n o t w r i t e “ 0 ” t o t h i s b i t w h e n u s i n g
P o r t X
M a i n c l o c k ( X
M a i n c l o c k d i v i s i o n r a t i o s e l e c t i o n b i t s
X
b 1 b 0
b 7 b 6
0
0
1
0 : 0 p a g e
1 : 1 p a g e
C I N
0
0
1
1
0 : I / O p o r t f u n c t i o n ( s t o p o s c i l l a t i n g )
1 : X
0 : O s c i l l a t i n g
1 : S t o p p e d
– X
3886 Group
0 : S i n g l e - c h i p m o d e
1 : N o t a v a i l a b l e
X : N o t a v a i l a b l e
C
0 :
1 :
0 :
1 : N o t a v a i l a b l e
C I N
s w i t c h b i t
C O U T
– X
= f ( X
= f ( X
= f ( X
C O U T
0 0 3 B
I N
o s c i l l a t i o n f u n c t i o n . )
– X
I N
I N
C I N
O U T
) / 2 ( h i g h - s p e e d m o d e )
) / 8 ( m i d d l e - s p e e d m o d e )
o s c i l l a t i n g f u n c t i o n
) / 2 ( l o w - s p e e d m o d e )
1 6
) s t o p b i t
)