CY8C20065-24LKXIT

Application Specific Microcontrollers Overview

The CY8C20065-24LKXIT is an 8-bit microcontroller from the Cypress PSoC 1 family, utilizing the M8C core. It supports in-system serial programming (ISSP) via a proprietary protocol defined in document 001-57631 Rev. *H. The device interface requires specific pin drive modes for SDATA and SCLK during programming operations. The ISSP protocol facilitates flash code protection and manufacturing updates through vectors that manage silicon ID verification, erase cycles, and security settings.

Application Specific Microcontrollers Feature Summary

• Supports In-System Serial Programming (ISSP) using a proprietary protocol distinct from I2C.
• Features a bidirectional SDATA line with variable drive modes: strong drive for output and resistive pull-down for input/waiting.
• Includes hardware code protection mechanisms accessible via the Set Security procedure.
• Utilizes a 22-bit vector command format for programming operations.

Application Specific Microcontrollers Applications

• In-circuit prototyping and manufacturing programming.
• In-system field updates for deployed devices.
• Production environments requiring silicon ID verification and rerun checks.

Application Specific Microcontrollers Procurement Notes

Verify compatibility with host programmer hardware against the specifications in document 001-57631. Ensure the programmer can handle the required TTL levels and current capabilities for VDD. Confirm support for the specific drive mode transitions on the SDATA pin to prevent communication errors during the Wait-and-Poll phases.

Application Specific Microcontrollers Selection Notes

Select this component if ISSP capability is required for production or field updates. The host programmer must be capable of toggling power if the XRES pin is unavailable. Design external circuitry to avoid external pull-up resistors on SDATA, as the internal 5.6 kΩ pull-down resistor is critical for detecting high-to-low transitions.

Application Specific Microcontrollers Part Context

This part belongs to the CY8C20xx6A series within the PSoC 1 architecture. It shares the ISSP programming interface specifications with related models such as CY8C20045, CY8C20055, and CY8C20xx7. The programming flow and vector definitions are standardized across these variants in the referenced specification.

Application Specific Microcontrollers Replacement Considerations

Compatible replacements include other CY8C20xx6A series devices that adhere to the same ISSP protocol. Verify silicon ID values match when substituting, as the READ-ID-WORD procedure validates the specific device variant before programming proceeds.

Application Specific Microcontrollers FAQ

Is the ISSP protocol compatible with I2C?

No, the ISSP protocol uses a bidirectional data line but is not related to the I2C protocol. It is a proprietary Cypress protocol.

What is the function of the SDATA pin during programming?

SDATA serves as the serial data in/out line. It operates in strong drive mode when sending data to the host and in resistive pull-down mode when waiting for or receiving data from the host.

How does the programmer detect the end of a mnemonic execution?

The target drives SDATA high while executing a mnemonic and switches to logic low when finished. The programmer must wait and poll for this high-to-low transition.