HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 76

• 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

HD404328 Series
Addressing Modes
RAM Addressing Modes
The MCU has three RAM addressing modes, as shown in figure 44 and described below.
Register Indirect Addressing Mode: The contents of the W, X, and Y registers (10 bits in total) are used
as a RAM address.
Direct Addressing Mode: A direct addressing instruction consists of two words. The first word contains
the opcode, and the contents of the second word (10 bits) are used as a RAM address.
Memory Register Addressing Mode: The memory registers (MR), which consist of 16 digits from $040–
$04F, are accessed with the LAMR and XMRA instructions.
72
1st word of instruction
Opcode
Figure 44 RAM Addressing Modes
Memory Register Addressing
Register Indirect Addressing
RAM address
RAM address
RAM address
Direct Addressing
W register
AP
AP
AP
W
d
0
1
9
9
9
9
AP
AP
AP
W
d
0
8
0
8
8
8
AP
AP
AP
X
d
Opcode
0
3
2nd word of instruction
7
7
7
7
X register
AP
AP
AP
X
d
1
2
6
6
6
6
Instruction
AP
AP
AP
X
d
0
1
5
5
5
5
AP
AP
AP
X
d
0
0
4
4
4
4
AP
AP
AP
Y
m
d
3
3
3
3
3
3
Y register
AP
AP
AP
Y
m
d
2
2
2
2
2
2
AP
AP
AP
Y
m
d
1
1
1
1
1
1
AP
AP
AP
Y
d
m
0
0
0
0
0
0