7906 datasheet(401/531 Pages) RENESAS

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FLASH MEMORY VERSION

7906 Group User’s Manual Rev.2.0

19-24

19.3 Flash memory serial I/O mode

(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.

Fig. 19.3.4 Example of handling pins with jumper switches used

Fig. 19.3.5 Example of handling pins with analog switches used

M37906F

RESET

User reset signal (Note 2)

User system board

Connected to the user system circuit.

MD1

SDA(P25)

BUSY(P 26)

SCLK(P 24)

XIN

XOUT

P6OUTCUT (Note 1)

VSS

VCC

MD0

Connected to

serial progra-

mmer.

Note 1: Recommended to be connected with VCC via a resistor.

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.

❈: The flash memory version of the 7906 Group

❈

RESET

MD1

SDA(P25)

BUSY(P 26)

SCLK(P 24)

XIN

XOUT

P6OUTCUT

VSS

VCC

MD0

74 HC4066

User system board

Connected to the user system circuit.

M37906F

❈

(Note 1)

Connected to

serial progra-

mmer.

User reset signal (Note 2)

❈: The flash memory version of the 7906 Group

Note 1: Recommended to be connected with VCC via a resistor.

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.

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