W78C438C40FL Datasheet W78C438C40FL | P16-P18

W78C438C

- 16 -

7.2 Data Memory Read/Write Cycle

S1

S2

S3

S8

S9

S10

S11

S12

S4

S5

S6

S7

XTAL1

PSEN

data

addr.

RD

DP4<7:0>

WR

DP4<7:0>

DATA OUT

addr.

T

RS

T

ARL

T

RDV

T

RDQ

T

WS

T

DWL

T

WDQ

T

AWL

AP6<7:0>

DPH or HB SFR out

PGM address

DPL or Ri out

AP5<7:0>

AP7<3:0>

addr <19:16> out

(When bit7 of EPMA is 0.)

W78C438C

Publication Release Date: March 10, 2010

- 17 - Revision A7

8. TYPICAL APPLICATION CIRCUITS

8.1 Using 128K × 8 bit External EPROM (W27E010)

4

5

6

7

8

9

10

11

12

13

14

15

16

17

1

2

3

18

19

20

21

22

23

24

25

26

27

28

29

30

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

12

3

4

8

9

7

89012

3

456789

0

6 5

888888889999999991

0

P1.5

AP5.7

P

2

.

2

P2.3

P2.4

P0.5

P0.7

P0.6

AP5.6

AP5.5

AP5.4

AP5.3

AP5.2

AP5.1

AP5.0

P2.5

P2.6

P2.7

PSEN

ALE

EA

A

P

6

.

7

01 2

3

3 3

3 4 5

3

3 3

6

3

7 8

3 3

9 0

4 4

1 2 3 4 5 6 7 8

9

4 4 4 4 4 4 4 4 5

A

X

T

L

1

X

T

A

L

2

5 V

8.2 K

10 U

C2

C1

R

P1.6

P1.7

RESET

P8.1

P8.2

P8.3

P8.4

P8.5

P3.0, RXD

P3.1, TXD

P3.3, INT1

P3.4, T0

INT3

P3.2, INT0

P3.5, T1

P3.6, WR

INT2

P8.0

P8.6

P8.7

A

P

7

.

3

,

/

C

S

3

A

P

7

.

2

,

/

C

S

2

A

P

7

.

1

,

/

C

S

1

A

P

7

.

0

,

/

C

S

0

A

P

6

.

6

A

P

6

.

5

A

P

6

.

4

A

P

6

.

3

A

P

6

.

2

P

3

.

7

,

/

R

D

A

P

6

.

0

A

P

6

.

1

P

2

.

1

P

2

.

0

P0.4

P

1

.

4

P

1

.

3

P

1

.

2

P

1

.

1

P

1

.

0

D

P

4

.

7

D

P

4

.

6

D

P

4

.

5

D

P

4

.

4

D

P

4

.

3

D

P

4

.

2

D

P

4

.

1

D

P

4

.

0

P

0

.

0

P

0

.

1

P

0

.

2

P

0

.

3

VDD

VSS

W78C438C

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

A14

29

A15

3

CE

OE

O0

13

O1

14

O2

15

O3

17

O4

18

O5

19

O6

20

O7

21

GND

A16

Vpp

Vcc

PGM

Vss

2

22

24

1

32

31

16

V

D

N

C

N

C

NC

W27E010

V

S

N

C

W78C438C

- 18 -

Figure A

CRYSTAL C1 C2 R

16 MHz 30P 30P

−

24 MHz 15P 15P

−

33 MHz 10P 10P 6.8K

40 MHz 5P 5P 6.8K

Above table shows the reference values for crystal applications.

Notes:

1. For C1, C2, R components refer to Figure A.

2. It is recommended that the crystals be replaced with oscillators for applications above 35 MHz.

W78C438C40FL

W78C438C40FL

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