UPD17217CT-XXX Ver la hoja de datos (PDF) - NEC => Renesas Technology

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Fabricante

UPD17217CT-XXX

4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

NEC => Renesas Technology 

µPD17215, 17216, 17217, 17218

2.3 Stack

A stack is a register to save a program return address and the contents of system registers (to be described later) when

a subroutine is called or when an interrupt is accepted.

2.3.1 Stack configuration

Fig. 2-3 shows the stack configurarion.

A stack consists of a stack pointer (a 4-bit binary counter, the upper 1-bit fixed to 0), five 11-bit (µPD17215)/12-bit

(µPD17216)/13-bit (µPD17217, 17218) address stack registers, and three 5-bit (µPD17215, 17216)/6-bit (µPD17217,

17218) interrupt stack registers.

Fig. 2-3 Stack Configuration

Stack pointer

(SP)

b3 b2 b1 b0

0 SPb2 SPb1 SPb0

WDOUT pin goes low

when the contents

of the stack pinter

are 6H-7H.

Address stack registers

(ASR)

b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

0H

Address stack register 0

1H

Address stack register 1

2H

Address stack register 2

3H

Address stack register 3

4H

Address stack register 4

5H

Undefined

6H

Undefined

7H

Undefined

µ PD17215

µPD17216

µ PD17217, 17218

Interrupt stack registers

(INTSK)

b5

b4

0H BANKSK0 BCDSK0

b3

CMPSK0

b2

CYSK0

1H BANKSK1 BCDSK1 CMPSK1 CYSK1

2H BANKSK2 BCDSK2 CMPSK2 CYSK2

b1

ZSK0

ZSK1

ZSK2

µPD17215, 17216

µ PD17217, 17218

b0

IXESK0

IXESK1

IXESK2

12

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