CY7C66013-PVC Cypress Semiconductor Corp, CY7C66013-PVC Datasheet - Page 12

• Manufacturer Part Number: CY7C66013-PVC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C66013-PVC

• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / RoHS Status: Not Compliant

5.0
5.1
The 14-bit program counter (PC) allows access to up to 8 KB of EPROM available with the CY7C66xxx architecture. The top 32
bytes of the ROM in the 8K part are reserved for testing purposes. The program counter is cleared during reset, such that the
first instruction executed after a reset is at address 0x0000h. This is typically a jump instruction to a reset handler that initializes
the application, reference Interrupt Vectors on page 24.
The lower eight bits of the program counter are incremented as instructions are loaded and executed. The upper six bits of the
program counter are incremented by executing an XPAGE instruction. As a result, the last instruction executed within a 256-byte
“page” of sequential code should be an XPAGE instruction. The assembler directive “XPAGEON” will cause the assembler to
insert XPAGE instructions automatically. As instructions can be either one or two bytes long, the assembler may occasionally
need to insert a NOP followed by an XPAGE for correct execution.
The address of the next instruction to be executed, carry flag, and zero flag are saved as two bytes on the program stack during
an interrupt acknowledge or a CALL instruction. The program counter, carry flag, and zero flag are restored from the program
stack during a RETI instruction. Only the program counter is restored during a RET instruction.
Please note that the program counter cannot be accessed directly by the firmware. The program stack can be examined by
reading SRAM from location 0x00 and up.
14-Bit Program Counter (PC)
Programming Model
PRELIMINARY
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CY7C66011/12/13
CY7C66111/12/13