MB89620 series
CHAPTER 13 A/D CONVERTER
253
13
Table 13.3.2 A/D Control Register 2 (ADC2) Bits
Bit
Function
Bit 7
Bit 6
Bit 5
Unused bits
• The read value is indeterminate.
• Writing to these bits has no effect on the operation.
Bit 4
ADCK:
Input clock selection
bit
This bit selects the input clock used to activate the A/D conversion or sense
function when continuous activation is specified (EXT = “1”). Setting this bit to “0”
selects the timebase timer output (divide-by-2
8
source oscillation). Setting this bit
to “1” selects the external clock input to the ADST pin.
Bit 3
ADIE:
Interrupt request
enable bit
This bit enables or disables an interrupt request output to the CPU.
An interrupt request is output when both this bit and the interrupt request flag bit
(ADC1: ADI) are “1”.
Bit 2
ADMD:
Function selection bit
This bit switches between the A/D conversion function and sense function.
The A/D converter operates as the A/D conversion function when this bit is set to
“0” and as the sense function when this bit is set to “1”.
Check: Do not modify this bit when the conversion-in-progress bit (ADC1: ADMV)
is set to “1”. Also, clear the interrupt request flag bit (ADC1: ADI = “0”) at
switching functions.
Bit 1
EXT:
Continuous
activation enable bit
This bit selects whether to activate the A/D conversion and sense functions by
software or to operate continuously synchronized with an input clock.
Setting this bit to “0” enables software activation by the A/D converter activation
bit (ADC1: AD). Setting this bit to “1” enables continuous activation on the rising
edge of the clock selected in the input clock selection bit (ADC2: ADCK).
Bit 0
RESV1:
Reserved bit
Check: • Always write “1” to this bit.
• The read value is always “1”.
Summary of Contents for F2MC-8L MB89620 Series
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