7906 datasheet(397/531 Pages) RENESAS

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FLASH MEMORY VERSION

7906 Group User’s Manual Rev.2.0

19-20

19.3 Flash memory serial I/O mode

Table 19.3.1 Pin description in flash memory serial I/O mode

Supply VCC level voltage to pin Vcc.

Supply VSS level voltage to pin Vss.

Connect this pin to VSS.

Connect this pin to VSS via a resistor (about 10 k

Ω to 100 kΩ).

The reset input pin (Note 1).

Connect a ceramic resonator or quartz-crystal oscillator between

XIN and XOUT pins. When using an external clock, the clcok source

must be input to XIN pin and XOUT pin must be left open.

The VCONT pin. (Not used in this mode.)

Connect this pin to VCC.

Connect this pin to VSS.

The VREF pin. (Not used in this mode.)

Input port pins. (Not used in this mode.)

The input pin for a serial clock.

The I/O pin for serial data. This pin must be connected with VCC via

a resistor (about 1 k

Ω).

The BUSY signal output pin.

Input port pins. (Not used in this mode.)

The P6OUTCUT pin. (Not used in this mode.)

Recommended to be connected with VCC via a resistor.

VCC

VSS

MD0

MD1

RESET

XIN

XOUT

VCONT

AVCC

AVSS

VREF

P10 to P17

P20 to P23,

P27

P24

P25

P26

P50 to P57

P60 to P65

P7 0 to P7 4

P6OUTCUT

Input

Output

—

Input

I/O

Output

Input

Name

Input/Output

Functions

Power supply input

MD0

MD1

Reset input

Clock input

Clock output

Filter circuit connection

Analog supply input

Reference voltage input

Input port P1

Input port P2

SCLK input

SDA I/O

BUSY output

Input port P5

Input port P6

Input port P7

P6OUTCUT input

Notes 1: 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 off the current flow between the user reset signal and pin RESET by using a

jumper switch, etc. (Refer to section “19.3.2 Examples of handling control pins in flash memory

serial I/O mode.”)

2: For pins not used in the flash memory serial I/O mode, properly connect to somewhere in the user

system. For pins not used in the user system, handle them with reference to section “5.3 Examples of

handling unused pins.” For pins used in the flash memory serial I/O mode, handle them with reference

to section “19.3.2 Examples of handling control pins in flash memory serial I/O mode.”

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