HMS87C4460 데이터 시트보기 (PDF) - Hynix Semiconductor

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HMS87C4460

8-BIT SINGLE-CHIP MICROCONTROLLERS

Hynix Semiconductor 

HMS81C4x60

8.3 Data Memory

Figure 8-8 shows the internal Data Memory space availa-

ble. Data Memory is divided into four groups, a user RAM,

control registers, Stack, and OSD memory.

0000H

RAM (192 bytes)

00C0H

0100H

0200H

Peripheral Reg. (64 bytes)

RAM (256 bytes)

Stack area

RAM (256 bytes)

0300H

RAM (256 bytes)

0400H

0440H

0500H

RAM (64 bytes)

NOT USED

NOT USED

0600H

0700H

RAM (Slicer RAM)

( 256 Byte)

Not Used

0A00H

0AC0H

0B00H

OSD RAM (192 bytes)

Peripheral Reg. (32 bytes)

OSD RAM (192 bytes)

0BC0H Peripheral Reg. (32 bytes)

0C00H

NOT USED

0FFFH

Page0

Page1

Page2

Page3

Page4

Page5

Page6

PageA

PageB

Figure 8-8 Data Memory Map

User Memory

The GMS81C4x60 has 1,024 × 8 bits for the user memory

(RAM) except Peripheral Reg. (64 bytes) .

Control Registers

The control registers are used by the CPU and Peripheral

function blocks for controlling the desired operation of the

device. Therefore these registers contain control and status

bits for the interrupt system, the timer/ counters, analog to

digital converters and I/O ports. The control registers are in

address range of 0C0H to 0FFH.

Note that unoccupied addresses may not be implemented

on the chip. Read accesses to these addresses will in gen-

eral return random data, and write accesses will have an in-

determinate effect.

More detailed informations of each register are explained

in each peripheral section.

Note: Write only registers can not be accessed by bit ma-

nipulation instruction. Do not use read-modify-write instruc-

tion. Use byte manipulation instruction.

Example; To write at CKCTLR

LDM CKCTLR,#05H ;Divide ratio ÷ 8

Stack Area

The stack provides the area where the return address is

saved before a jump is performed during the processing

routine at the execution of a subroutine call instruction or

the acceptance of an interrupt.

When returning from the processing routine, executing the

subroutine return instruction [RET] restores the contents of

the program counter from the stack; executing the interrupt

return instruction [RETI] restores the contents of the pro-

gram counter and flags.

The save/restore locations in the stack are determined by

the stack pointed (SP). The SP is automatically decreased

after the saving, and increased before the restoring. This

means the value of the SP indicates the stack location

number for the next save. Refer to Figure 8-4 on page 22.

Address Symbol

00C0H

00C1H

00C2H

00C3H

00C4H

00C5H

00C6H

00C7H

00C8H

00C9H

00CAH

00CBH

00CCH

00CDH

00CEH

00CFH

R0

R0DD

R1

R1DD

R2

R2DD

R3

R3DD

R4

R4DD

reserved

reserved

reserved

reserved

FUNC

PLLC

R/W

Reset Value

Addressin

g mode

R/W ???????? byte, bit1

W 00000000 byte2

R ???????? byte, bit

W ---00000 byte

R/W ???????? byte, bit

W --000000 byte

R/W ???????? byte, bit

W 00000000 byte

R/W ???????? byte, bit

W ----0000 byte

-

-

-

-

-

-

-

-

-

-

-

-

W 0000000- byte

W -0000000 byte

Table 8-1Control registers

26

November 2001 Ver 1.1

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