UPD750064CU datasheet(17/82 Pages) NEC

номер детали	UPD750064CU

подробное описание детали	4-BIT SINGLE-CHIP MICROCONTROLLERS

PDF	82 Pages

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производитель	NEC [NEC]

домашняя страница	http://www.nec.com/

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µPD750064, 750066, 750068, 750064(A), 750066(A), 750068(A)

Data Sheet U10165EJ2V0DS00

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 stack bank select register (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 100

×BNote at the beginning of a program. When using

the Mk II mode, it must be initialized to 000

×BNote.

Note

Set the desired value in the

× position.

Figure 4-1. Stack Bank Select Register Format

SBS3

SBS2

SBS1

SBS0

3210

Symbol

SBS

Address

F84H

Memory bank 0

Memory bank 1

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

Since 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.

UPD750064CU датащи(PDF) 17 Page - NEC