7546 查看數據表（PDF） - Renesas Electronics

零件编号

产品描述 (功能)

生产厂家

7546

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

7546 Group

Memory

Special function register (SFR) area

The SFR area in the zero page contains control registers such as

I/O ports and timers.

RAM

RAM is used for data storage and for a stack area of subroutine

calls and interrupts.

ROM

The first 128 bytes and the last 2 bytes of ROM are reserved for

device testing and the rest is a user area for storing programs.

Interrupt vector area

The interrupt vector area contains reset and interrupt vectors.

Zero page

The 256 bytes from addresses 000016 to 00FF16 are called the

zero page area. The internal RAM and the special function regis-

ters (SFR) are allocated to this area.

The zero page addressing mode can be used to specify memory

and register addresses in the zero page area. Access to this area

with only 2 bytes is possible in the zero page addressing mode.

Special page

The 256 bytes from addresses FF0016 to FFFF16 are called the

special page area. The special page addressing mode can be

used to specify memory addresses in the special page area. Ac-

cess to this area with only 2 bytes is possible in the special page

addressing mode.

ROM Code Protect Address (address FFDB16)

Address FFDB16, which is the reserved ROM area of QzROM, is

the ROM code protect address. “0016” is written into this address

when selecting the protect bit write by using a serial programmer

or selecting protect enabled for writing shipment by Renesas

Technology corp.. When “0016” is set to the ROM code protect ad-

dress, the protect function is enabled, so that reading or writing

from/to QzROM is disabled by a serial programmer.

As for the QzROM product in blank, the ROM code is protected by

selecting the protect bit write at ROM writing with a serial pro-

grammer.

As for the QzROM product shipped after writing, “0016” (protect

enabled) or “FF16” (protect disabled) is written into the ROM code

protect address when Renesas Technology corp. performs writing.

The writing of “0016” or “FF16” can be selected as the ROM option

setup (referred to as “Mask option setup” in MM) when ordering.

s Notes

Because the contents of RAM are indefinite at reset, set initial val-

ues before using.

RAM area

RAM capacity

(bytes)

384

512

address

XXXX16

01BF16

023F16

RAM

Function set ROM consists of the followings:

- Function set ROM data to set peripheral

functions to be active immediately after system

is released from reset,

- ROM code protect to disable the reading of

the built-in PROM area by serial programmer,

- Renesas shipment test area where random

data are written in when shipment test is

performed by Renesas.

000016

004016

010016

XXXX16

044016

SFR area

Reserved area

Not used

Zero page

Address

FFD416 Renesas shipment test area

FFD516

FFD616

FFD716

Renesas shipment test area

Renesas shipment test area

Renesas shipment test area

FFD816 Function set ROM data 0

FFD916 Function set ROM data 1

FFDA16 Function set ROM data 2

FFDB16 ROM code protect

ROM

ROM area

ROM capacity

(bytes)

8192

16384

address

YYYY16

E00016

C00016

address

ZZZZ16

E08016

C08016

YYYY16

ZZZZ16

Reserved ROM area

(128 bytes)

FF0016

FFD4 16

FFDC16

Function set ROM function area

Interrupt vector area

FFFE16

FFFF16

Reserved ROM area

Special page

Fig. 10 Memory map diagram

Rev.1.21 Nov 15, 2006 page 13 of 93

REJ03B0160-0121

Share Link: