HD404849 Datasheet, PDF (94/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 Series
A/D Data Register (ADRL: $017, ADRU: $018): 8-bit read-only register consisting of a 4-bit lower
digit and 4-bit upper digit. This register is not cleared by reset. Any data read during A/D conversion is
not guaranteed. After the completion of A/D conversion, the resultant eight-bit data is held in this register
until the start of the next conversion (figures 79, 80, and 81).
ADRU: $018
3
2
1
0
ADRL: $017
3
2
1
0
MSB
Bit 7
Figure 79 A/D Data Registers
LSB RESULT
Bit 0
A/D data register (lower digit) (ADRL: $017)
Bit
Initial value
Read/Write
Bit name
3
0
R
ADRL3
2
0
R
ADRL2
1
0
R
ADRL1
0
0
R
ADRL0
Figure 80 A/D Data Register Lower Digit (ADRL)
A/D data register (upper digit) (ADRU: $018)
Bit
Initial value
Read/Write
Bit name
3
2
1
0
1
0
0
0
R
R
R
R
ADRU3 ADRU2 ADRU1 ADRU0
Figure 81 A/D Data Register Upper Digit (ADRU)
94