7547 datasheet(89/91 Pages) RENESAS

89 / 91 page

Rev.1.21

Nov 15, 2006

page 89 of 89

REJ03B0156-0121

7547 Group

Notes on On-chip Oscillation Division Ratio

• When the clock division ratio is switched from f(XIN) to on-chip

oscillator by the clock division ratio selection bits (bits 7 and 6 of

CPU mode register (address 3B16)), the on-chip oscillator divi-

sion ratio (bits 1 and 0 of on-chip oscillation division ratio

selection register (address 3716)) is “102” (on-chip oscillator

middle-speed mode (ROSC/8)).

Notes on Oscillation Stop Detection Circuit

1. After the reset by the oscillation stop detection, the value of fol-

lowing bits are retained, not initialized.

• Ceramic or RC oscillation stop detection function active bit

Bit 1 of MISRG (address 3B16)

• Oscillation stop detection status bit

Bit 3 of MISRG

2. Oscillation stop detection status bit is initialized (“0”) by the fol-

lowing operation.

• External reset

• Write “0” data to the ceramic or RC oscillation stop detection

function active bit.

3. The oscillation stop detection circuit is not included in the emu-

lator MCU “M37542RSS”.

Note on Power Source Voltage

When the power source voltage value of a microcomputer is less

than the value which is indicated as the recommended operating

conditions, the microcomputer does not operate normally and may

perform unstable operation.

In a system where the power source voltage drops slowly when

the power source voltage drops or the power supply is turned off,

reset a microcomputer when the supply voltage is less than the

recommended operating conditions and design a system not to

cause errors to the system by this unstable operation.

Product shipped in blank

As for the product shipped in blank, Renesas does not perform the

writing test to user ROM area after the assembly process though

the QzROM writing test is performed enough before the assembly

process. Therefore, a writing error of approx.0.1 % may occur.

Moreover, please note the contact of cables and foreign bodies on

a socket, etc. because a writing environment may cause some

writing errors.

NOTES ON HARDWARE

Handling of Power Source Pin

In order to avoid a latch-up occurrence, connect a capacitor suit-

able for high frequencies as bypass capacitor between power

source pin (Vcc pin) and GND pin (Vss pin). Besides, connect the

capacitor to as close as possible. For bypass capacitor which

should not be located too far from the pins to be connected, a ce-

ramic capacitor of 0.01

µF to 0.1 µF is recommended.

NOTES ON QzROM

Notes On QzROM Writing Orders

When ordering the QzROM product shipped after writing, submit

the mask file (extension: .mask) which is made by the mask file

converter MM.

Be sure to set the ROM option ("MASK option" written in the mask

file converter) setup when making the mask file by using the mask

file converter MM.

Notes On ROM Code Protect

(QzROM product shipped after writing)

As for the QzROM product shipped after writing, the ROM code

protect is specified according to the ROM option setup data in the

mask file which is submitted at ordering.

Renesas Technology corp. write the value of the ROM option

setup data in the ROM code protect address (address FFDB16)

when writing to the QzROM. As a result, in the contents of the

ROM code protect address the ordered value may differ from the

actual written value.

The ROM option setup data in the mask file is “0016” for protect

enabled or “FF16” for protect disabled. Therefore, the contents of

the ROM code protect address (other than the user ROM area) of

the QzROM product shipped after writing is “0016” or “FF16”.

Note that the mask file which has nothing at the ROM option data

or has the data other than “0016” and “FF16” can not be accepted.

DATA REQUIRED FOR QzROM WRITING

ORDERS

The following are necessary when ordering a QzROM product

shipped after writing:

1. QzROM Writing Confirmation Form*

2. Mark Specification Form*

3. ROM data...........Mask file

* For the QzROM writing confirmation form and the mark specifi-

cation form, refer to the “Renesas Technology Corp.” Homepage

(http://www.renesas.com/homepage.jsp).

Note that we cannot deal with special font marking (customer's

trademark etc.) in QzROM microcomputer.

7547 Datasheet(PDF) 89 Page - Renesas Technology Corp

7547 Datasheet(HTML) 89 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

Datasheet Download

Link URL