MC68HC05V12 Datasheet, PDF (131/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Analog-to-Digital (A/D) Converter
A/D Data Register
CH4–CH0 — Channel Select Bits
CN4, CH3, CH2, CH1, and CH0 form a 5-bit field which is used to
select one of nine A/D channels, including four internal references.
Channels $00−04 correspond to port D input pins on the MCU.
Channels $10−$13 are used for internal reference points. In single-
chip mode, channel $13 is reserved and converts to $00. Table 13-1
shows the signals selected by the channel select field.
Table 13-1. A/D Channel Assignments
CH4–CH0
00–04
$10
$11
$12
$13
$05−$0F, $14−$1F
Signal
AD0–AD4
V_REFH
(V_REFH–V_REFL)/2
V_REFL
Factory test
Unused
13.6 A/D Data Register
An 8-bit result register is provided. This register is updated each time the
COCO bit is set.
Address: $001D
Bit 7
6
5
4
3
2
1
Bit 0
Read: D7
D6
D5
D4
D3
D2
D1
D0
Write:
Reset:
Unaffected by reset
= Unimplemented
Figure 13-2. A/D Data Register (ADDR)
MC68HC05V12 — Rev. 2.0
Analog-to-Digital (A/D) Converter
For More Information On This Product,
Go to: www.freescale.com
Technical Data