A/D Data Register (Addh And Addl) - Fujitsu F2MC-8L F202RA Hardware Manual

CHAPTER 12 A/D CONVERTER
12.4.3

A/D Data Register (ADDH and ADDL)

A/D data register (ADDH and ADDL) stores the results of A/D conversion at 10-bit A/D
conversion.
The high-order 2 bits of 10-bit data correspond to the ADDH register. The low-order 8
bits correspond to the ADDL register.
■
A/D Data Register (ADDH and ADDL)
Figure 12.4-4 shows the bit configuration of the A/D data registers.
ADDH (A/D data register H)
Address
0032
ADDL (A/D data register L)
Address
0033
Of the 10-bit A/D data, the high-order 2 bits correspond to bits 1 and 0 in the ADDH register. The low-
order 8 bits correspond to bits 7 to 0 in the ADDL register.
● When A/D conversion functions are enabled
When A/D conversion is activated, after about 38 instruction cycles, the data on the conversion results are
fixed and stored to these registers. Therefore, after A/D conversion, read these registers (conversion
results), write "0" to the ADI bit (bit3) in the ADC1 register until the next A/D conversion is completed,
and clear the flags after A/D conversion. During A/D conversion, the values in these registers are not
determined. When A/D conversion functions are enabled, these registers function as read-only registers.
270
Figure 12.4-4 A/D Data Registers (ADDH and ADDL)
bit7 bit6 bit5
H
bit7 bit6 bit5
H
R R R
R : Read only
X : Undefined
bit4 bit3 bit2 bit1
R
bit4 bit3 bit2 bit1
R R R R
bit0 Initial value
------XX
B
R
bit0
Initial value
XXXXXXXX
B
R