7545 datasheet(13/62 Pages) RENESAS

13 / 62 page

Rev.1.06

Mar 07, 2008

Page 13 of 59

REJ03B0140-0106

7545 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. RAM consists of RAM1 and RAM2. The

power source for RAM1 is supplied from VCC pin. The power

source for RAM2 is supplied from VDDR pin.

Note: When the VDDR pin is used, connect an approximately 0.1

µF bypass capacitor across the VSS line and the VDDR line.

When not used, connect it to VSS.

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

registers(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. Access to

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

addressing mode.

Function Set ROM Area

[Renesas shipment test area]

Figure 10 shows the Assignment of Function set ROM area.

The random data are set to the Renesas shipment test areas

(addresses FFD416 to address FFD916).

Do not rewrite the data of these areas.

When the checksum is included in the user program, avoid

assigning it to these areas.

[Function set ROM data] FSROM

Function set ROM data (address FFDA16) is used to set modes of

peripheral functions. By setting this area, the operation mode of

each peripheral function are set after system is released from

reset.

Refer to the descriptions of peripheral functions for the details of

operation of peripheral functions.

• Watchdog timer

• Low voltage detection circuit

This mode setting of peripheral functions cannot be changed by

program after system is released from reset.

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

address, 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

programmer.

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.

<Notes>

1. Because the contents of RAM are indefinite at reset, set ini-

tial values before using.

2. Do not access to the reserved area.

3. Random data is written into the Renesas shipment test area

and the reserved ROM area. Do not rewrite the data in these

areas. Data of these area may be changed without notice.

Accordingly, do not include these areas into programs such

as checksum of all ROM areas.

4. The QzROM values in function set ROM data set the oper-

ating modes of the various peripheral functions after an

MCU reset is released. Do not fail to set the value for the

selected function. Bits designated with a fixed value of 1 or

0 must be set to the designated value.

5. Emulator MCU: As for M37545RLSS, set “010000XX2” to

Function set ROM data (address FFDA16). Also, set “FF16”

to ROM code protect (address FFDB16).

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