Using the seven-segment display in Figure 3.17 and the timer interface registers in Figure 3.14, write a RISC-style program that flashes decimal digits in the repeating sequence 0, 1, 2, , 9, 0, . . Each digit is to be displayed for one second. Assume that the counter in the timer circuit is driven by a 100-MHz clock.

Figure 3.17

Figure 3.14

The program in Figure 13 accomplishes the required task. Comments in the program explain how this task is performed. Write the program for the flashes decimal digits in the repeating sequence.

d Number a b c d e f g 0 1111110 1 2 0110000 1101101 3 4 5 6 7 8 9 1111 001 0110011 1011011 10 111 11 1110000 ------- 11011 Address 0x4020 0x4024 0x4028 0x402C 31 7 4 3 Initial count value 2 I TON ZERO TIRQ TIM_STATUS UP FREE RUN TIE Current count value TIM_CONT TIM_INIT TIM_COUNT