Rev. 3.0, 03/01, page 334 of 390
19.1.2
Block Diagram
Bus Intergace
Module data bus
ADCSR
A/D conversion
control circuit
ADDRD
ADDRC
ADDRB
ADDRA
AVcc
AVss
1.8MHz
ADI
interrupt
signal
+
-
Analog
multiplexer
Sample-and-
hold circuit
AN0
AN2
AN1
AN3
Comparator
TMOUT#
ADCAL
ADCALCR
1/2 VDD
10-bit D/A
Successive-
approximation
register
Figure 19.1 A/D Converter Block Diagram
19.1.3
Input Pins
Four analog input pins from AN0 to AN3 are provided. AVcc and AVss are the power supply pins
and ground pin respectively for the analog circuits in the A/D converter.
Table 19.1
A/D Converter Pins
Pin Name
Abbreviation
I/O
Function
Analog power supply pin
AVcc
I
Analog power supply
Analog ground pin
AVss
I
Analog ground and reference voltage
Analog input pin 0
AN0 (TSMX)
I
Analog inputs
Analog input pin 1
AN1 (TSMY)
I
Analog input pin 2
AN2 (TSPX)
I
Analog input pin 3
AN3 (TSPY)
I
Summary of Contents for HD64465
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