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UPD754202 Datasheet(PDF) 13 Page - NEC |
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UPD754202 Datasheet(HTML) 13 Page - NEC |
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13 / 66 page  13 µPD754202, 754202(A) 4.2 Setting Method of Stack Bank Select Register (SBS) Switching between the Mk I mode and Mk II mode can be done by the SBS. Figure 4-1 shows the format. The SBS is set by a 4-bit memory manipulation instruction. When using the Mk I mode, the SBS must be initialized to 1000B at the beginning of a program. When using the Mk II mode, it must be initialized to 0000B. Figure 4-1. Stack Bank Select Register Format SBS3 SBS2 SBS1 SBS0 3210 Symbol SBS Address F84H 00 0 1 0 Memory bank 0 Other than above setting prohibited 0 must be set in the bit 2 position. Stack area specification Mk II mode Mk I mode Mode switching specification Caution Because SBS.3 is set to “1” after a RESET signal is generated, the CPU operates in the Mk I mode. When executing an instruction in the Mk II mode, set SBS.3 to “0” to select the Mk II mode. |
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