mc68hc916y3 Freescale Semiconductor, Inc, mc68hc916y3 Datasheet - Page 209

• Manufacturer Part Number: mc68hc916y3
• Description: Mc68hc16y3 16 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

10.1 General
10.2 External Connections
MC68HC16Y3/916Y3
USER’S MANUAL
This section is an overview of the analog-to-digital converter module (ADC). Refer to
the ADC Reference Manual (ADCRM/AD) for a comprehensive discussion of ADC ca-
pabilities. Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for ADC timing
and electrical specifications. Refer to D.6 Analog-to-Digital Converter Module for reg-
ister address mapping and bit/field definitions.
The ADC is a unipolar, successive-approximation converter with eight modes of oper-
ation. It has selectable 8 or 10-bit resolution. Monotonicity is guaranteed in both
modes.
A bus interface unit handles communication between the ADC and other microcontrol-
ler modules, and supplies IMB timing signals to the ADC. Special operating modes and
test functions are controlled by a module configuration register (ADCMCR) and a fac-
tory test register (ADCTST).
ADC module conversion functions can be grouped into three basic subsystems: an an-
alog front end, a digital control section, and result storage. Figure 10-1 is a functional
block diagram of the ADC module.
In addition to use as multiplexer inputs, the eight analog inputs can be used as a gen-
eral-purpose digital input port (port ADA), provided signals are within logic level spec-
ification. A port data register (PORTADA) is used to access input data.
The ADC uses 12 pins on the MCU package. Eight pins are analog inputs (which can
also be used as digital inputs), two pins are dedicated analog reference connections
(V
RH
and V
SECTION 10ANALOG-TO-DIGITAL CONVERTER
RL
), and two pins are analog supply connections (V
Freescale Semiconductor, Inc.
For More Information On This Product,
ANALOG-TO-DIGITAL CONVERTER
Go to: www.freescale.com
DDA
and V
SSA
MOTOROLA
).
10-1