HMS77C1000A Datasheet, PDF(25/45 Page) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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HMS77C1000A Datasheet, PDF (25/45 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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HMS77C1000A/HMS77C1001A

9.3.6 FSR Register

The FSR register is an 8-bit register. The lower 5 bits are

used to store indirect address for data memory. The upper

3 bits are unimplemented and read as â0â. Figure 9-9

shows how the FSR register can be used in indirect ad-

dressing mode.

In reset state, the FSR register is initialized with

â1XXX_XXXXBâ.

Instruction Word

11

54

0

OPCODE

8

4

0

- --

FSR

Address : 04H

RESET Value: 1XXX_XXXXB

Direct Addressing mode

0

Indirect Addressing mode

1

Data Memory Address

FIGURE 9-9 FSR REGISTER AND DIRECT/INDIRECT ADDRESSING MODE

9.3.7 OPTION Register

The OPTION register consists of 8-bit write-only register

and can not addressed. This register is able to control the

status of PFD, TMR0/WDT prescaler and TMR0.

To modify the OPTION register, the content of W register

are transferred to the OPTION register by executing the

OPTION instruction.

In reset state, the OPTION register is initialized with

â00111111Bâ .

22

Oct. 2001 Ver. 2.0

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