mc68hc05jb4p Freescale Semiconductor, Inc, mc68hc05jb4p Datasheet - Page 99

• Manufacturer Part Number: mc68hc05jb4p
• Description: Mc68hc705jb4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68HC05JB4
REV 2
(V
(V
RH
RH
The analog to digital converter system consists of a single 8-bit successive
approximation converter and an 16-channel analog multiplexer. Six of the chan-
nels are available for analog inputs, four channels are dedicated to internal test
functions, and the remaining six channels are unused. There is one 8-bit ADC
Data Register ($0F) and one 8-bit ADC Status and Control register ($0E). The ref-
erence supply, V
pins PC4 and PC5) instead of the power supply lines, because drops caused by
loading in the power supply lines would degrade the accuracy of the analog to dig-
ital conversion. An internal RC oscillator is available if the bus speed is low
enough to degrade the ADC accuracy. An ADON bit allows the ADC to be
switched off to reduce power consumption, which is particularly useful in the Wait
mode.
+V
+V
RL
RL
AD0
AD1
AD2
AD3
AD4
AD5
V
V
RH
)/2
)/4
RL
Figure 11-1. ADC Converter Block Diagram
ANALOG TO DIGITAL CONVERTER
Freescale Semiconductor, Inc.
RL
For More Information On This Product,
and V
ANALOG TO DIGITAL CONVERTER
ADC Data Register ($0F)
RH
Result
Go to: www.freescale.com
for the converter uses two input pins (shared with port
8
Successive approximation
February 24, 1999
SECTION 11
with sample and hold
8-bit capacitive DAC
register and control
ADC Status and Control Register ($0E)
CH0
CH1
CH2
GENERAL RELEASE SPECIFICATION
CH3
ADON
VRH
VRL
ADRC
COCO