Program memory is implemented in Flash EPROM. Consequently, accessing pro- gram memory is generally slower than...

 

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Program memory is implemented in Flash EPROM. Consequently, accessing pro- gram memory is generally slower than accessing data memory and, at higher SYSCLK speeds, the processor may need to insert wait states (extra cycles). Assume a PIC32MX470F512L in answering the following about program memory: (a) What is the maximum SYSCLK for which no wait states are inserted? (b) With a SYSCLK of 80 MHz how many wait states are inserted? (c) At the maximum SYSCLK of 120 MHz how many wait states are inserted? (c) At the maximum SYSCLK of 120 MHz how long does the memory store instruction, sw ra, 20 (sp), take to execute? Compare with the same instruction and an 80 MHz SYSCLK. Program memory is implemented in Flash EPROM. Consequently, accessing pro- gram memory is generally slower than accessing data memory and, at higher SYSCLK speeds, the processor may need to insert wait states (extra cycles). Assume a PIC32MX470F512L in answering the following about program memory: (a) What is the maximum SYSCLK for which no wait states are inserted? (b) With a SYSCLK of 80 MHz how many wait states are inserted? (c) At the maximum SYSCLK of 120 MHz how many wait states are inserted? (c) At the maximum SYSCLK of 120 MHz how long does the memory store instruction, sw ra, 20 (sp), take to execute? Compare with the same instruction and an 80 MHz SYSCLK.