UPD17708 datasheet(32/356 Pages) NEC

32 / 356 page

µPD17704, 17705, 17707, 17708, 17709

3.3 Stack Pointer (SP)

3.3.1 Configuration and function of stack pointer

Figure 3-3 shows the configuration and functions of the stack pointer.

The stack pointer consists of a 4-bit binary counter.

It specifies the address of an address stack register.

A value can be directly read from or written to the stack pointer by using a register manipulation instruction.

Figure 3-3. Configuration and Function of Stack Pointer

Retained

Power-ON reset

WDT&SP reset

CE reset

Clock stop

Name

Flag symbol

Address

01H

Read/Write

R/W

Stack pointer

(SP)

Address 0 (ASR0)

Address 1 (ASR1)

Address 2 (ASR2)

Address 3 (ASR3)

Address 4 (ASR4)

Address 5 (ASR5)

Address 6 (ASR6)

Address 7 (ASR7)

Address 8 (ASR8)

Address 9 (ASR9)

Address 10 (ASR10)

Address 11 (ASR11)

Address 12 (ASR12)

Address 13 (ASR13)

Address 14 (ASR14)

Setting prohibited

Specifies address of address stack register (ASR)

Power-ON reset

WDT&SP reset

CE reset

Clock stop

: Reset by RESET pin up on power application

: Reset by watchdog timer and stack pointer

: CE reset

: Upon execution of clock stop instruction

UPD17708 Datasheet(PDF) 32 Page - NEC

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