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ADDRESS SPACE
S3F80P5_UM_ REV1.00
8-BIT WORKING REGISTER ADDRESSING
You can also use 8-bit working register addressing to access registers in a selected working register area. To
initiate 8-bit working register addressing, the upper four bits of the instruction address must contain the value
1100B. This 4-bit value (1100B) indicates that the remaining four bits have the same effect as 4-bit working
register addressing.
As shown in Figure 2-13, the lower nibble of the 8-bit address is concatenated in much the same way as for 4-bit
addressing: Bit 3 selects either RP0 or RP1, which then supplies the five high-order bits of the final address. The
three low-order bits of the complete address are provided by the original instruction.
Figure 2-14 shows an example of 8-bit working register addressing. The four high-order bits of the instruction
address (1100B) specify 8-bit working register addressing. Bit 4 ("1") selects RP1 and the five high-order bits in
RP1 (10101B) become the five high-order bits of the register address. The three low-order bits of the register
address (011) are provided by the three low-order bits of the 8-bit instruction address. The five-address bits from
RP1 and the three address bits from the instruction are concatenated to form the complete register address,
0ABH (10101011B).
8-bit physical address
Register pointer
provides five
high-order bits
Address
Selects
RP0 or RP1
RP1
RP0
8-bit logical
address
1
1
0
0
These address
bits indicate
8-bit working
register
addressing
Three low-
order bits
Figure 2-14. 8-Bit Working Register Addressing
2-18
Содержание S3F80P5X
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Страница 19: ...S3F80P5_UM_ REV1 00 PRODUCT OVERVIEW BLOCK DIAGRAM 24 PIN PACKAGE Figure 1 1 Block Diagram 24 pin 1 3 ...
Страница 48: ...ADDRESS SPACE S3F80P5_UM_ REV1 00 NOTES 2 22 ...
Страница 122: ...INTERRUPT STRUCTURE S3F80P5_UM_ REV1 00 NOTES 5 18 ...
Страница 210: ...INSTRUCTION SET S3F80P5_UM_ REV1 00 NOTES 6 88 ...
Страница 216: ...CLOCK AND POWER CIRCUITS S3F80P5_UM_ REV1 00 NOTES 7 6 ...
Страница 266: ...COUNTER A S3F80P5_UM_ REV1 00 NOTES 12 8 ...
Страница 290: ...EMBEDDED FLASH MEMORY INTERFACE S3F80P5_UM_ REV1 00 NOTES 14 18 ...
Страница 316: ...S3F80P5_UM_ REV1 00 ELECTRICAL DATA STOP LED This LED is ON when the evaluation chip S3E80PB is in stop mode 19 5 ...
Страница 321: ...DEVELOPMENT TOOLS S3F80P5_UM_ REV1 00 NOTES 19 10 ...