7906 datasheet(400/531 Pages) RENESAS

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FLASH MEMORY VERSION

7906 Group User’s Manual Rev.2.0

19-23

19.3 Flash memory serial I/O mode

19.3.2. Example of handling control pins in flash memory serial I/O mode

Each of pins P24 to P26, MD0, and MD1 serves as an input/output pin for a control signal in the flash

memory serial I/O mode. Examples of handling these pins and pin RESET on the board are described

below.

(1) With control signals not affecting user system circuit

When control signals in the flash memory serial I/O mode are not used in the user system circuit, or

when these signals do not affect that circuit, the connections shown in Figure 19.3.3 are available.

When pin P6OUTCUT, however, is used in the user system circuit, see Figures 19.3.4 and 19.3.5.

Fig. 19.3.3 Example of handing control pins when control signals do not affect user system circuit

P6OUTCUT

M37906F

User system board

RESET

MD1

SDA(P25)

BUSY(P 26)

SCLK(P 24)

XIN

XOUT

User reset signal (Note)

Not used, or Connected to the user system circuit

Note: 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.

VSS

VCC

MD0

Connected to

serial progra-

mmer.

❈: The flash memory version of the 7906 Group

❈

7906 Datasheet(PDF) 400 Page - Renesas Technology Corp