S912XHZ512F1VAG Datasheet, PDF (404/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 9 Analog-to-Digital Converter (ATD10B16CV4) Block Description
9.3.2.16.2 Right Justified Result Data
Module Base + 0x0010 = ATDDR0H,
0x0012 = ATDDR1H,
0x0014 = ATDDR2H,
0x0016 = ATDDR3H
0x0018 = ATDDR4H,
0x001A = ATDDR5H,
0x001C = ATDDR6H,
0x001E = ATDDR7H
0x0020 = ATDDR8H,
0x0022 = ATDDR9H,
0x0024 = ATDDR10H,
0x0026 = ATDDR11H
0x0028 = ATDDR12H,
0x002A = ATDDR13H,
0x002C = ATDDR14H,
0x002E = ATDDR15H
7
6
5
4
3
2
1
R (10-BIT)
0
0
0
0
0
0
BIT 9 MSB
R (8-BIT)
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 9-20. Right Justified, ATD Conversion Result Register x, High Byte (ATDDRxH)
0
BIT 8
0
0
Module Base + 0x0011 = ATDDR0L,
0x0013 = ATDDR1L,
0x0015 = ATDDR2L,
0x0017 = ATDDR3L
0x0019 = ATDDR4L,
0x001B = ATDDR5L,
0x001D = ATDDR6L,
0x001F = ATDDR7L
0x0021 = ATDDR8L,
0x0023 = ATDDR9L,
0x0025 = ATDDR10L,
0x0027 = ATDDR11L
0x0029 = ATDDR12L,
0x002B = ATDDR13L,
0x002D = ATDDR14L,
0x002F = ATDDR15L
7
R (10-BIT) BIT 7
R (8-BIT) BIT 7 MSB
6
BIT 6
BIT 6
5
BIT 5
BIT 5
4
BIT 4
BIT 4
3
BIT 3
BIT 3
2
BIT 2
BIT 2
1
BIT 1
BIT 1
W
Reset
0
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 9-21. Right Justified, ATD Conversion Result Register x, Low Byte (ATDDRxL)
0
BIT 0
BIT 0
0
9.4 Functional Description
The ATD10B16C is structured in an analog and a digital sub-block.
9.4.1 Analog Sub-block
The analog sub-block contains all analog electronics required to perform a single conversion. Separate
power supplies V_DDA and V_SSA allow to isolate noise of other MCU circuitry from the analog sub-block.
9.4.1.1 Sample and Hold Machine
The sample and hold (S/H) machine accepts analog signals from the external world and stores them as
capacitor charge on a storage node.
The sample process uses a two stage approach. During the first stage, the sample amplifier is used to
quickly charge the storage node.The second stage connects the input directly to the storage node to
complete the sample for high accuracy.
MC9S12XHZ512 Data Sheet, Rev. 1.06
404
Freescale Semiconductor