HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 60
HD4074329S
Manufacturer Part Number
HD4074329S
Description
MCU 4-Bit HMCS400 CISC 20KB EPROM 3.3V/5V 64-Pin SDIP
Manufacturer
Renesas Electronics America
Datasheet
1.HD4074329S.pdf
(98 pages)
Specifications of HD4074329S
Package
64SDIP
Family Name
HMCS400
Maximum Speed
4.5 MHz
Ram Size
268 Byte
Program Memory Size
20 KB
Operating Supply Voltage
3.3|5 V
Data Bus Width
4 Bit
Program Memory Type
EPROM
Number Of Programmable I/os
35
On-chip Adc
4-chx8-bit
Operating Temperature
-20 to 75 °C
Number Of Timers
3
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HD404328 Series
A/D Converter
The MCU has a built-in A/D converter that uses a sequential comparison method with a resistor ladder. It
can measure four analog inputs with an eight-bit resolution. As shown in the block diagram of figure 34,
the A/D converter has a four-bit A/D mode register, a one-bit A/D start flag, and a four-bit plus four-bit
A/D data register.
A/D Mode Register (AMR: $016): Four-bit write-only register which selects the A/D conversion period
and indicates analog input pin information. Bit 0 of the AMR selects the A/D conversion period, and bits 2
and 3 select a channel, as shown in figure 35.
A/D Start Flag (ADSF: $020, Bit 2): One-bit flag that initiates A/D conversion when 1 is written to it.
At the completion of A/D conversion, the converted data is stored in the A/D data register and the ADSF is
cleared. Refer to figure 35.
Note: Use the SEM and SEMD instructions to write data to the ADSF, but make sure that the ADSF is
56
AN
AN
AN
AN
AV
AV
CC
SS
0
1
2
3
not written to during A/D conversion.
A/D mode register
Internal bus line (S2)
(AMR: $016)
Operation mode signal
(Stop mode, Watch mode, Subactive mode: Value is 0)
Figure 34 A/D Converter Block Diagram
2
Comparator
+
–
4
1
(ADSF: $020)
A/D start flag
Control logic
1
1
A/D data register
(ADRL: $017,
ADRU: $018)
Internal bus line (S1)
Counter
4
4
IFAD
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