PD17225_15 Datasheet, PDF (24/86 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

µPD17225, 17226, 17227, 17228
2.5 Register File (RF)
The register file mainly consists of registers that set the conditions of the peripheral hardware.
These registers can be controlled by dedicated instructions PEEK and POKE, and the embedded macro instructions
of RA17K, SETn, CLRn, and INITFLG.
2.5.1 Configuration of register file
Figure 2-8 shows the configuration of the register file and how the register file is accessed by the PEEK and POKE
instructions.
The control registers are controlled by using dedicated instructions PEEK and POKE. Since the control registers are
assigned to addresses 00H-3FH regardless of the bank, the addresses 00H-3FH of the general-purpose data memory
cannot be accessed when the PEEK or POKE instruction is used.
The addresses that can be accessed by the PEEK and POKE instructions are the addresses 00H-3FH of the control
registers and 40H-7FH of the general-purpose data memory. The register file consists of these addresses.
The control registers are assigned to addresses 80H-BFH on the IE-17K to facilitate debugging.
Figure 2-8. Register File Access with PEEK or POKE Instructions
Column address
0 1 2 3 4 5 6 7 8 9 ABCDEF
0
1
2
Data memory
3
4
5
POKE M063, WR
6
7
System register
0
PEEK WR, SP
1
2
POKE LCDMD, WR
3
Control register
Register file
22
Data Sheet U12643EJ2V0DS00