UPD17230MC-XXX-5A4 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD17230MC-XXX-5A4

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

NEC => Renesas Technology 

µPD17230, 17231, 17232, 17233, 17234, 17235, 17236

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

Figure 2-5 shows the stack configurarion.

A stack consists of a stack pointer (a 4-bit binary counter, the high-order 1 bit fixed to 0), five 11-bit (µPD17230)/

12-bit (µPD17231)/13-bit (µPD17232, 17233)/14-bit (µPD17234, 17235, 17236) address stack registers, and three

6-bit interrupt stack registers.

Figure 2-5. Stack Configuration

Stack pointer

(SP)

b3 b2 b1 b0

0 SPb2 SPb1 SPb0

The RESET pin is

internally pulled down

and reset is effected.

Address stack registers

(ASR)

b13 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 PD17230

µ PD17231

µPD17232, 17233

µ PD17234, 17235, 17236

b5

0H BANKSK0

1H BANKSK1

2H BANKSK2

b4

BCDSK0

BCDSK1

BCDSK2

Interrupt stack registers

(INTSK)

b3

CMPSK0

b2

CYSK0

CMPSK1 CYSK1

CMPSK2 CYSK2

b1

ZSK0

ZSK1

ZSK2

b0

IXESK0

IXESK1

IXESK2

Data Sheet U14360EJ1V0DS00

17

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