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| 型號： | 7549 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 11/73頁 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 11 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
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.
The user area includes the function set ROM area.
Interrupt Vector Area
The interrupt vector area contains reset and interrupt vectors.
Zero Page
The 256 bytes from addresses 0000
16
to 00FF
16
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 FF00
16
to FFFF
16
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 8 shows the Assignment of Function set ROM area.
The random data are set to the Renesas shipment test areas
(addresses FFD4
16
to address FFD7
16
).
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] FSROM0, FSROM1, FSROM2
Function set ROM data 0 to 2 (addresses FFD8
16
to FFDA
16
) are
used to set modes of peripheral functions.
By setting values to these areas, the operation mode of each
peripheral function are set after releasing reset.
Refer to the descriptions of peripheral functions for the details of
operation of peripheral functions.
Clock circuit
Watchdog timer
Low voltage detection circuit
[ROM code protect]
Address FFDB
16
of QzROM version is ROM code protect
address and cannot be used for programming. “00
16
” is written
into this address when selecting the protect bit write by using a
serial programmer and selecting protect enabled for writing
shipment by Renesas Technology corp.. When “00
16
” is set to
the ROM code protect address, the protect func-tion is enabled,
so that reading or writing from/to the corresponding area 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, “00
16
” (protect
enabled) or “FF
16
” (protect disabled) is written into the ROM code
protect address when Renesas Technology corp. performs writing.
The writing of “00
16
” or “FF
16
” can be selected as ROM option setup
(“MASK option” written in the mask file converter) when ordering.
<Notes>
(1) Because the contents of RAM are indefinite at reset, set
initial 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 0 to 2 set the
operating 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7-5-4905 | 功能描述:3M 4905 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4905 零件狀態(tài):在售 厚度 - 粘合劑:- 厚度 - 底布，載體:- 標(biāo)準(zhǔn)包裝:1 |
| 754905-1 | 功能描述:PIN ATT/ROLL AUTO IV 制造商:te connectivity amp connectors 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:1 |
| 7-5-4910 | 功能描述:3M 4910 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4910 零件狀態(tài):在售 底布，載體:丙烯酸泡棉 厚度 - 粘合劑:- 厚度 - 底布，載體:- 標(biāo)準(zhǔn)包裝:1 |
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