Cypress CY8C21534, CY8C21334, CY8C21634 Pin Definitions CY8C21001 56-Pin Ssop, OCD Hclk, OCD Cclk

						CY8C21634, CY8C21534
						CY8C21434, CY8C21334, CY8C21234
Table 7. Pin Definitions - CY8C21001 56-Pin (SSOP) (continued)
Pin No.		Type			Pin Name	Description
	Digital			Analog
19	IO				P3[3]
20	IO				P3[1]
21					NC	No connection.
22					NC	No connection.
23	IO				P1[7]	I2C Serial Clock (SCL).
24	IO				P1[5]	I2C Serial Data (SDA).
25					NC	No connection.
26	IO				P1[3]	IFMTEST.
27	IO				P1[1]	Crystal Input (XTALin), I2C Serial Clock (SCL), ISSP-SCLK[3]..
28	Power				Vss	Ground connection.
29					NC	No connection.
30					NC	No connection.
31	IO				P1[0]	Crystal Output (XTALout), I2C Serial Data (SDA), ISSP-SDATA[3]..
32	IO				P1[2]	VFMTEST.
33	IO				P1[4]	Optional External Clock Input (EXTCLK).
34	IO				P1[6]
35					NC	No connection.
36					NC	No connection.
37					NC	No connection.
38					NC	No connection.
39					NC	No connection.
40					NC	No connection.
41	Input				XRES	Active high external reset with internal pull down.
42	OCD				HCLK	OCD high-speed clock output.
43	OCD				CCLK	OCD CPU clock output.
44	IO				P3[0]
45	IO				P3[2]
46					NC	No connection.
47					NC	No connection.
48	IO		I		P2[0]
49	IO		I		P2[2]
50	IO				P2[4]
51	IO				P2[6]
52	IO		I		P0[0]	Analog column mux input.
53	IO		I		P0[2]	Analog column mux input and column output.
54	IO		I		P0[4]	Analog column mux input and column output.
55	IO		I		P0[6]	Analog column mux input.
56	Power				Vdd	Supply voltage.

LEGEND: A = Analog, I = Input, O = Output, and OCD = On-Chip Debug.

Document Number: 38-12025 Rev. *O Page 14 of 45

[+] Feedback