HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 47
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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Pull-Up MOS Transistor Control: A program-controlled pull-up MOS transistor is provided for each
input/output pin. The on/off status of all these transistors is controlled by bit 3 of port mode register C
(PMRC), and the on/off status of an individual transistor can also be controlled by the port data register of
the corresponding pin—enabling on/off control of that pin alone.
The on/off status of each transistor and the peripheral function mode of each pin can be set independently.
The configuration of the I/O buffer is shown in figure 25, and the configurations of various program-
controlled I/O circuits are given in table 23.
How to Deal with Unused I/O Pins: I/O pins that are not needed by the user system (floating) must be
connected to V
their pull-up MOS transistors or by resistors of about 100 k .
Port mode register C (PMRC): $012
LCD output register (LOR): $015
3
3
LOR
Bit 3
0
1
PMRC
Bit 3
CC
0
1
SEG13–SEG16
2
to prevent LSI malfunctions due to noise. These pins must either be pulled up to V
2
Port
Selection
R5
Pull-Up MOS
On/Off Selection
1
1
Figure 24 I/O Switching Mode Registers (cont)
Off
On
LOR
Bit 2
0
0
0
1
SEG9–SEG12
PMRC
Initial value: 0000, R/W: W
Initial value: 0000, R/W: W
Port
Selection
Bit 3
0
1
BUZZ output frequency selection
R1 /BUZZ pin mode selection
Pull-up MOS transistor on/off selection
R4
3
R2/SEG1–SEG4 pin mode selection
R3/SEG5–SEG8 pin mode selection
R4/SEG9–SEG12 pin mode selection
R5/SEG13–SEG16 pin mode selection
Port
Selection
BUZZ
R1
LOR
Bit 1
3
0
1
SEG5–SEG8
Port
Selection
R3
LOR
Bit 0
HD404328 Series
0
1
SEG1–SEG4
Port
Selection
R2
CC
by
43
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