7470 Datasheet, PDF(31/47 Page) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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7470 Datasheet, PDF (31/47 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS

7470/7471 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

XCIN

XCOUT

XIN

XOUT

1/2

CM6

CM7

1/2

CM7

(Note 1)

T34M0

1/8

T34M1

T34M2

Timer 3

Timer 4

Internal clock Ï

STP

instruction

WIT

instruction

QQ SS

Reset

Interrupt disable flag I

Interrupt request

Notes 1 : Refer to Timer 3 of [Figure 6 Block diagram of timer 1 through 4]

2 : 7470 group does not have X CIN input and XCOUT output.

Reset

STP instruction

Select gate : At reset, shaded

side is connected

Fig. 25 Block diagram of clock generating circuit

Fig. 26 Structure of CPU mode register

CPU mode register

(Address 00FB16)

These bits must always be set to â0â.

Stack page selection bit (Note 1)

0 : In page 0 area

1 : In page 1 area

Nothing is allocated (The value is undefined at reading)

S50, P51/XCIN, XCOUT selection bit (Note 2)

0 : P50, P51

1 : XCIN, XCOUT

XCOUT drive capacity selection bit (Note 2)

0 : Low

1 : High

Clock (XIN-XOUT) stop bit (Note 2)

0 : Oscillates

1 : Stops

Internal system clock selection bit (Note 2)

0 : XIN-XOUT selected (normal mode)

1 : XCIN-XCOUT selected (low-speed mode)

Notes 1 : In the M37470M2, M37470M4/E4, M37471M2, M37471M4/E4, set this bit to â0â.

2 : In the 7470 group, set this bit to â0â.

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