Operations And Setting Procedure Example - Fujitsu MB95630H Series Hardware Manual

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MB95630H Series

Operations and Setting Procedure Example

The comparator can be activated by the software according to the setting of the

PD bit in the CMR0C register.

■ Software Activation of Comparator

The settings shown in Figure 27.5-1 are required for activating the comparator using the

❍ : Bit to be used

× : Unused bit

0 : Set to "0"

After the comparator is activated as shown above, it has to stabilize before starting to operate.

Before activating the comparator, set the IE bit in the CMR0C register to "0" in advance in

order to avoid any unexpected interrupt generated due to the comparator being unstable

at its startup.

■ Setting Procedure Example

Below is an example of procedure for setting the comparator:

● Initial settings

1. Disable the comparator interrupt request. (CMR0C:IE = 0)

2. Activate the comparator according to the settings shown in Figure 27.5-1.

3. Wait until the comparator stabilizes.

4. Clear the interrupt flag bit. (CMR0C:IF = 0)

5. Enable the comparator interrupt request (CMR0C:IE = 1), and enable the comparator output

(CMR0C:VCOE = 1) if necessary.

MN702-00009-1v0-E

Figure 27.5-1 Settings for Activating Comparator

FUJITSU SEMICONDUCTOR LIMITED

CHAPTER 27 COMPARATOR

27.5 Operations and Setting Procedure Example