upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 23

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

(5) General-purpose data memory
Notes 1. Address 6FH of BANK1 can be used as a general-purpose data memory area.
Caution No data can be written to or read from addresses 72H and 73H of BANK1.
The general-purpose data memory area is an area of the data memory excluding the system register area,
and the port register area. This memory area has a total of 447 nibbles (111 nibbles in BANK0 and 336 nibbles
(112 nibbles × 3) in BANK1 to BANK3).
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7 P1A
2. Bits 0 to 2 of address 70H of BANK1 are used. Bit 3 is fixed to 0.
3. Only bit 0 of address 71H of BANK1 is used. Bits 1 to 3 are fixed to 0.
P0A P0B P0C P0D
Note 2
0
0
P1B
Note 3
1
1
2
2
Column address
Column address
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
3
3
Figure 2-6. Configuration of Data Memory (1/2)
4
4
5
5
6
6
Data Sheet U15002EJ1V1DS
7
7
BANK 1
BANK 0
System register (SYSREG)
System register (SYSREG)
8
8
9
9
A
A
B
B
C
C
Data buffer (DBF)
D
D
E
E
P0E
Note 1
F
F
Example
Address 1AH
in BANK 0
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