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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： | 4/55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
Flash organization
The XA contains 64k bytes of Flash program memory.
This memory is organized as 5 separate blocks. The
first two blocks are 8k bytes in size, filling the program
memory space from address 0 through 3FFF hex. The
final three blocks are 16k bytes in size and occupy ad-
dresses from 4000 through FFFF hex.
Figure 3 depicts the Flash memory configuration.
Flash Programming and Erasure
The XA Flash microcontroller supports a number of pro-
gramming possibilities for the on-chip Flash memory. The
Flash memory may be programmed in a parallel fashion
on standard programming equipment in a manner similar
to an EPROM microcontroller. The XA microcontroller is
able to program its own Flash memory while the applica-
tion code is running. Also, a default loader built into a
Boot ROM allows programming blank devices serially
through the UART.
Using any of these types of programming, any of the
individual blocks may be erased separately, or the entire
chip may be erased. Programming of the Flash memory
is accomplished one byte at a time.
Boot ROM
When the microcontroller programs its own Flash
memory, all of the low level details are handled by code
that is permanently contained in a 2k byte “Boot ROM”
that is separate from the Flash memory. A user program
simply calls the entry point with the appropriate
parameters to accomplish the desired operation. Boot
ROM operations include things like: erase block, program
byte, verity byte, program security lock bit, etc. The Boot
ROM overlays the program memory space at the top of
the address space from F800 to FFFF hex, when it is
enabled by setting the ENBOOT bit at AUXR1.7.. The
Boot ROM may be turned off so that the upper 2k bytes
of Flash program memory are accessible for execution.
ENBOOT and PWR_VLD
Setting the ENBOOT bit in the AUXR register enables
the Boot ROM and activates the on-chip V
PP generator if
V
PP is connected to rather than 12V externally. The
PWR_VLD flag indicates that V
PP is available for
programming and erase operations. This flag should be
checked prior to calling the Boot ROM for programming
and erase services. When ENBOOT is set, it typically
takes 5 microseconds for the internal programming
voltage to be ready.
The ENBOOT bit will automatically be set if the status
byte is non-zero during reset, or when PSEN is low, ALE
is high, and EA is high at the falling edge of reset. Other-
wise, ENBOOT will be cleared during reset.
When programming functions are not needed, ENBOOT
may be cleared. This enables access to the 2k bytes of
Flash code memory that is overlaid by the Boot ROM,
allowing a full 64k bytes of Flash cede memory.
Figure 3. Flash Memory Configuration
FFFF
C000
8000
F800
4000
2000
0000
BLOCK 4
16K BYTES
BOOT ROM
BLOCK 3
16K BYTES
BLOCK 2
16K BYTES
PROGRAM
ADDRESS
BLOCK 1
8K BYTES
BLOCK 0
8K BYTES
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