m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 427

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

FLASH MEMORY VERSION
19.3 Flash memory serial I/O mode
Fig. 19.3.5 Example of handling pins with analog switches used
19-24
Fig. 19.3.4 Example of handling pins with jumper switches used
(2) With control signals affecting user system circuit
In the flash memory serial I/O mode, be sure to cut the current flow toward the user system circuit
if control signals for this mode are also used in the user system circuit. Figure 19.3.4 shows an
example of handling pins with jumper switches used, and Figure 19.3.5 shows an example of handling
pins with analog switches used.
Connected to
serial progra-
mmer.
Connected to
serial progra-
mmer.
: The flash memory version of the 7905 Group
: The flash memory version of the 7905 Group
Note 1: Recommended to be connected with V
Note 1: Recommended to be connected with V
2: When there is a possibility that the user reset signal becomes “L” level in the flash memory serial I/O mode,
2: When there is a possibility that the user reset signal becomes “L” level in the flash memory serial I/O mode,
be sure to cut the current flow between the user reset pin and pin RESET by using a jumper switch, etc.
be sure to cut the current flow between the user reset pin and pin RESET by using a jumper switch, etc.
74 HC4066
7905 Group User’s Manual Rev.1.0
User reset signal (Note 2)
User reset signal (Note 2)
User system board
User system board
CC
CC
via a resistor.
via a resistor.
Connected to the user system circuit.
SDA(P2
SCLK(P2
P4OUT
MD1
R ESET
BUSY(P2
SDA(P2
BUSY(P2
SCLK(P2
R ESET
P4OUT
MD1
Connected to the user system circuit.
CUT
CUT
5
, P6OUT
5
)
4
6
, P6OUT
)
6
4
)
)
X
)
)
X
M37905F
IN
IN
M37905F
CUT
CUT
X
X
(Note 1)
OUT
(Note 1)
OUT
MD0
MD0
V
V
V
V
CC
SS
CC
SS