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参数资料
| 型号： | MX10EXAQI |
| 厂商： | MACRONIX INTERNATIONAL CO LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 30 MHz, MICROCONTROLLER, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 5/55页 |
| 文件大小： | 476K |
| 代理商： | MX10EXAQI |
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P/N:PM0625 Specifications subject to change without notice, contact your sales representatives for the most update information. REV. 1.0, JUL. 01, 2005
MX10EXA
FMIDLE
The FMIDLE bit in the AUXR register allows saving addi-
tional power by turning off the Flash memory when the
CPU is in the Idle mode. This must be done just prior to
initiating the Idle mode, as shown below.
OR
AUXR, #$40
;Set Flash memory to idle
mode.
OR
PCON, #$0l
;Turn on Idle mode.
.
;Execution resumes here when
Idle mode terminates.
When the Flash memory is put into the Idle mode by
setting FMIDLE, restarting the CPU upon exiting Idle
mode takes slightly longer, about 3 microseconds. How-
ever, the standby current consumed by the Flash memory
is reduced from about 8mA to about 1mA.
Default Loader
A default loader that accepts programming commands
in a predetermined format is contained permanently in
the Boot ROM. A factory fresh device will enter this loader
automatically if it is powered up without first being pro-
grammed by the user. Loader commands include func-
tions such as erase block; program Flash memory; read
Flash memory; and blank check.
Boot Vector
The XA contains two special FLASH registers: the BOOT
VECTOR and the STATUS BYTE.
The "Boot Vector" allows forcing the execution of a user
supplied Flash loader upon reset, under two specific sets
of conditions. At the falling edge of reset, the XA exam-
ines the contents of the Status Byte. If the Status Byte
is set to zero, power-up execution starts at location
0000H, which is the normal start address of the user’s
application code.
When the Status Byte is set to a value other than zero,
the Boot Vector is used as the reset vector (4 bytes),
including the Boot Program Counter (BPC) and the Boot
PSW (BPSW). The factory default settings are 8000h for
the BPSW and F800h for the BPC, which corresponds
to the address F900h for the factory masked-ROM ISP
boot loader. The Status Byte is automatically set to a
non-zero value when a programming error occurs. A cus-
tom boot loader can be written with the Boot Vector set
to the custom boot loader.
NOTE: When erasing the Status Byte or Boot Vector,
these bytes are erased at the same time. It is necessary
to reprogram the Boot Vector after erasing and updating
the Status Byte.
Hardware Activation of the Boot Vector
Program execution at the Boot Vector may also be forced
from outside of the microcontroller by setting the correct
state on a few pins. While Reset is asserted, the PSEN
pin must be pulled low, the ALE pin allowed to float high
(need not be pulled up externally), and the EA pin driven
to a logic high (or up to V
PP). Then reset may be released.
This is the same effect as having a non-zero status byte.
This allows building an application that will normally ex-
ecute the end user’s code but can be manually forced
into ISP operation. The Boot ROM is enabled when use
of the Boot Vector is forced as described above, so the
branch may go to the default loader. Conversely, user
code in the top 2k bytes of the Flash memory may not
be executed when the Boot Vector is used.
If the factory defauolt setting for the BPC (F800h) is
changed, it will no longer point to the ISP masked-ROM
boot loader code. If this happens, the only possible way
to change the contents of the Boot Vector is through the
parallel programming method, provided that the end user
application does not contain a customized loader that
provides for erasing and reprogramming of the Boot Vec-
tor and Status Byte.
After programming the FLASH, the status byte should
be erased to zero in order to allow execution of the user’s
application code beginning at address 0000H.
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相关代理商/技术参数 |
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| MX10FMAXDPC | 制造商:MCNIX 制造商全称:Macronix International 功能描述:SINGLE-CHIP 8-BIT MICROCONTROLLER |
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