MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 427

• Manufacturer Part Number: MMC2114
• Description: M CORE Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

19.2 Introduction
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
19.10.6.2
19.10.6.3
19.10.6.4
19.10.7 Continuous-Scan Modes . . . . . . . . . . . . . . . . . . . . . . . . . . 499
19.10.7.1
19.10.7.2
19.10.7.3
19.10.7.4
19.10.8 QADC Clock (QCLK) Generation . . . . . . . . . . . . . . . . . . . . 503
19.10.9 Periodic/Interval Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . .504
19.10.10 Conversion Command Word Table . . . . . . . . . . . . . . . . . .505
19.10.11 Result Word Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509
19.11 Pin Connection Considerations . . . . . . . . . . . . . . . . . . . . . . .509
19.11.1 Analog Reference Pins. . . . . . . . . . . . . . . . . . . . . . . . . . . .509
19.11.2 Analog Power Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510
19.11.3 Conversion Timing Schemes . . . . . . . . . . . . . . . . . . . . . . .512
19.11.4 Analog Supply Filtering and Grounding . . . . . . . . . . . . . . . 515
19.11.5 Accommodating Positive/Negative Stress Conditions . . . .517
19.11.6 Analog Input Considerations . . . . . . . . . . . . . . . . . . . . . . .519
19.11.7 Analog Input Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521
19.11.7.1
19.11.7.2
19.12 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524
19.12.1 Interrupt Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 524
19.12.2 Interrupt Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .525
The queued analog-to-digital converter (QADC) is a 10-bit, unipolar,
successive approximation converter. Up to eight analog input channels
can be supported using internal multiplexing. A maximum of 18 input
channels can be supported in the expanded, externally multiplexed
mode.
The QADC consists of an analog front-end and a digital control
subsystem, which includes an IPbus interface block.
Freescale Semiconductor, Inc.
For More Information On This Product,
Queued Analog-to-Digital Converter (QADC)
Externally Triggered Single-Scan Mode. . . . . . . . . . . . . 496
Externally Gated Single-Scan Mode . . . . . . . . . . . . . . . 497
Interval Timer Single-Scan Mode. . . . . . . . . . . . . . . . . . 497
Software-Initiated Continuous-Scan Mode. . . . . . . . . . . 500
Externally Triggered Continuous-Scan Mode . . . . . . . . 501
Externally Gated Continuous-Scan Mode . . . . . . . . . . . 501
Periodic Timer Continuous-Scan Mode . . . . . . . . . . . . . 502
Settling Time for the External Circuit . . . . . . . . . . . . . . . 522
Error Resulting from Leakage . . . . . . . . . . . . . . . . . . . . 523
Go to: www.freescale.com
Queued Analog-to-Digital Converter (QADC)
Advance Information
Introduction
427