Z86E3016PSG Datasheet, PDF (36/348 Pages) Zilog, Inc. – Z86E3016PSG

Z8 Family of Microcontrollers
User Manual
18
The upper nibble of the register pointer selects which group of 16 bytes in
the Register File, out of the 256 total bytes, will be accessed as working
registers. Table 5 shows an example.
Table 5. Register Pointer Access Example
R253 RP = 00h ;ERF Bank 0, Working Reg. Group 0.
R0 = Port 0 = 00h
R1 = Port 1 = 01h
R2 = Port 2 = 02h
R3 = Port 3 = 03h
R11 = GPR 0Bh
R15 = GPR 0Fh
If R253 RP = 0Fh ;ERF Bank F, Working Reg. Group 0.
R0 = PCON = 00h
R1 = Reserved = 01h
R2 = Reserved = 02h
R11 = SMR = 0Bh
R15 = WDTMR = 0Fh
Address Space
UM001602-0904