HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 47

• Manufacturer Part Number: HD4074329S
• Description: MCU 4-Bit HMCS400 CISC 20KB EPROM 3.3V/5V 64-Pin SDIP
• Manufacturer: Renesas Electronics America

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

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
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