The following statements are on clocks in ARM processor Whic

The following statements are on clocks in ARM processor. Which one is incorrect. External clock could be more accurate. To switch from internal clock to external clock, It is the programmer\'s responsibility to have the codes to check the external clock is ready. The energy efficient in ARM 10 is achieved by adjusting the clock rate. The higher the rate, the more efficient. The default clock is the internal clock, ie at reset, the internal clock is used. The following statements are on GPIO port configuration. Which one is incorrect? To configure pin 9 of port B as an open drain output with a maximum speed of 2MHz the pattern 1001 must be programmed into CNF9:MODE9. GPIOx_BSRR register can be used only for reset pins. Theoretically, 16 possible configuration can be achieved for each pin. 4 bits are needed to program each pin in a port. So totally 4 Times 16 = 64 bits are needed to program one port. So two 32 bit registers are used for this purpose. To turn on or off the Port E LEDs on the ARM board, the following action is needed: ie Enable clock, configuration and writing to the port. Which one the following statements on the operation is incorrect. To configure the high 8 bits of port E. the GPIOE_CRH register is needed to be programmed. Write 0x00ff to port E to turn on all the eight LEDs. To enable the clock,RCC_APB2ENR register is needed to be programmed. You don\'t need to configure the I/O Port for each I/O operation. Once they are configured, they can be used in the way they are configured till different operations are needed.

Solution

(6) answer is option (d)

As two clock signals are produced during reset

(7)answer is option (b)

there is other register GPIOx-BRR

(8) answer is option(d)