Sharp MZ-3500 service manual Clock circuit Schematic, Read Hold, Write Hold SET, Din, Stb

M 2 3500

8. OTHER INTERFACES

8-1. Clock circuit

1) Schematic

			T; 10	Ii2	u	"
			*	HDH		1
				l«"-.r
2) Clock timing
READ	HOLD .		READ
mode	mode	[	mode
Cn(CO~C2)	0 X	3	Y~l
STB	/ \		/ ^Ones digit of seconds
			Tens digit of seconds			Tens digit of month '
WRITE	HOLD					SET	i	HOLD
mode	mode					mode	I	mode
DIN	Don't care		X
CLK
DOUT
		Tens digit of seconds		Tens digit of month*

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