1-CHIP DIGITAL SIGNAL PROCESSOR

摘要

PURPOSE:To obtain a chip for evaluation of a program proper in size by applying an address, data and a write signal through the 1st, 2nd and 3rd terminals respectively and setting a coefficient to a coefficient memory from outside. CONSTITUTION:A terminal 20 is set at logic 1 in a program development mode. Then a 3-state buffer 18 is turned off and the side (b) of the input of a multiplexer 14 is selected. Thus an address can be given to a coefficient memory 11 from outside via a terminal 12. While a 3-state buffer 19 is turned on and data can be given to the memory 11 from outside via a terminal 17. Under such conditions, a write pulse is applied through a terminal 21 to write the data to the memory 11. Then the terminal 20 is set at logic 0 and the output of a program counter 10 is outputted to the outside of a chip through a terminal 12 via a buffer 20. Then an access is given to a program memory set outside, and the output of the program memory is supplied to an instruction register 15 through the terminal 17.