KS57P0504 datasheet(28/282 Pages) SAMSUNG

Part #	KS57P0504

Description	The KS57P0504 is the microcontroller which has 4 Kbyte one-time-programmable ROM and the functions are the same to KS57C0502/C0504

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Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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ADDRESS SPACES

KS57C0502/C0504/P0504 MICROCONTROLLER

2–16

PROGRAM COUNTER (PC)

A 12-bit program counter (PC) stores addresses for instruction fetches during program execution. Whenever a

reset operation

or an interrupt occurs, bits PC11 through PC0 are set to the vector address. Bit PC12–PC13 is re-

served to support future expansion of the device's ROM size.

Usually, the PC is incremented by the number of bytes of the instruction being fetched. One exception is the

1-byte REF instruction which is used to reference instructions stored in the ROM.

PROGRAM STATUS WORD (PSW)

The program status word (PSW) is an 8-bit word, mapped to RAM locations FB0H–FB1H, that defines system

status and program execution status and which permits an interrupted process to resume operation after an inter-

rupt request has been serviced. PSW values are mapped as follows:

FB0H

IS1

IS0

EMB

ERB

FB1H

C

SC2

SC1

SC0

The PSW can be manipulated by 1-bit or 4-bit read/write and by 8-bit read instructions, depending on the spe-

cific bit or bits being addressed. The PSW can be addressed during program execution regardless of the current

value of the enable memory bank (EMB) flag.

Part or all of the PSW is saved to stack prior to execution of a subroutine call or hardware interrupt. After the

interrupt has been processed, the PSW values are popped from the stack back to the PSW address.

When a RESET is generated, the EMB and ERB values are set according to the RESET vector address, and

the carry flag is left undefined (or the current value is retained). PSW bits IS0, IS1, SC0, SC1, and SC2 are all

cleared to logic zero.

Table 2–5. Program Status Word Bit Descriptions

PSW Bit Identifier

Description

Bit Addressing

Read/Write

IS1, IS0

Interrupt status flags

1, 4

R/W

EMB

Enable memory bank flag

1

R/W

ERB

Enable register bank flag

1

R/W

C

Carry flag

1

R/W

SC2, SC1, SC0

Program skip flags

8

R

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