UPD6134 NEC, UPD6134 Datasheet - Page 10

• Manufacturer Part Number: UPD6134
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

2.4 Program Memory (ROM): 512 steps
2.5 Data Memory (RAM): 32
memory is sometimes processed in 8-bit units. R0 can be used as the ROM data pointer.
10
3EAH
0FFH
1FFH
3E9H
3FFH
000H
100H
The ROM consists of 10 bits per step, and is addressed by the program counter.
The program memory stores programs and table data, etc.
The 22 steps from 3EAH to 3FFH cannot be used in the test program area.
Note The unmounted area and the test program area are so designed that a program or data placed in either
The data memory, which is a static RAM consisting of 32
RF is also used as the ASR.
When reset, R0 is cleared to “00H” and R1 to RF retain the previous data (undefined when turning on the power).
of them by mistake is returned to the 000H address.
Unmounted area
(a)
10 bits
PD6133
Note
Test
program area
1002 steps
4 Bits
Figure 2-3. Program Memory Map
Data Sheet U10454EJ6V0DS00
Note
10 bits ( PD6133)
10 bits ( PD6134)
4 bits, is used to retain processed data. The data
3EAH
0FFH
1FFH
2FFH
3E9H
3FFH
000H
100H
200H
300H
(b)
10 bits
PD6134
Test
program area
PD6133, 6134
Note