HD404849 Datasheet, PDF (97/127 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404849 Series
A/D Start Flag (ADSF: $020, Bit 2): One-bit flag that initiates A/D conversion when set to 1. At the
completion of A/D conversion, the converted data is stored in the A/D data register and the A/D start flag is
cleared. Refer to figure 82.
A/D start flag (ADSF: $020, bit 2)
Bit
Initial value
Read/Write
Bit name
3
0
R/W
DTON
2
0
R/W
ADSF
1
0
R/W
WDON
0
0
R/W
LSON
DTON
Refer to the description of operating
modes
WDON
Refer to the description of timers
ADSF (A/D start flag)
1
A/D conversion started
0
A/D conversion completed
LSON
Refer to the description of operating
modes
Figure 82 A/D Start Flag (ADSF)
A/D Current Off Flag (IAOF: $021, Bit 2): By setting this 1-bit flag to 1, the current flowing through the
ladder resistor of the A/D converter is cut off during standby and active modes. See figure 83.
95