s908gr32ag3vfa Freescale Semiconductor, Inc, s908gr32ag3vfa Datasheet - Page 67

• Manufacturer Part Number: s908gr32ag3vfa
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

3.8.2 ADC Data Register High and Data Register Low
3.8.2.1 Left Justified Mode
In left justified mode, the ADRH register holds the eight MSBs of the
10-bit result. The ADRL register holds the two LSBs of the 10-bit result. All other bits read as 0. ADRH
and ADRL are updated each time an ADC single channel conversion completes. Reading ADRH latches
the contents of ADRL until ADRL is read. All subsequent results will be lost until the ADRH and ADRL
reads are completed.
Freescale Semiconductor
Address:
Address:
1. If any unused channels are selected, the resulting ADC conversion will be unknown or re-
ADCH4
Reset:
Reset:
Read:
Read:
Write:
Write:
served.
MC68HC908GR60A • MC68HC908GR48A • MC68HC908GR32A Data Sheet, Rev. 5
1
1
1
1
1
1
1
1
1
↓
1
1
1
1
Figure 3-5. ADC Data Register High (ADRH) and Low (ADRL)
$003D
$003E
Bit 7
AD9
AD1
ADCH3
Table 3-1. Mux Channel Select
↓
0
0
0
0
0
0
0
0
1
1
1
1
1
= Unimplemented
AD8
AD0
6
ADCH2
0
0
0
0
1
1
1
1
0
↓
1
1
1
1
AD7
5
0
ADCH1
Unaffected by reset
Unaffected by reset
AD6
↓
0
0
1
1
0
0
1
1
0
0
0
1
1
4
0
AD5
ADCH0
(1)
3
0
0
1
0
1
0
1
0
1
0
↓
0
1
0
1
(Continued)
AD4
2
0
ADC power off
Input Select
PTG0/AD16
PTG1/AD17
PTG2/AD18
PTG3/AD19
PTG4/AD20
PTG5/AD21
PTG6/AD22
PTG7/AD23
Unused
V
V
AD3
REFH
1
0
REFL
ADRH
ADRL
Bit 0
AD2
0
I/O Registers
67