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參數(shù)資料
| 型號(hào)： | ADUC836BS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter, Dual 16-Bit-ADCs with Embedded 62 kB Flash MCU |
| 中文描述： | 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | 14 X 14 MM, MO-022-AC-1, MQFP-52 |
| 文件頁數(shù)： | 13/80頁 |
| 文件大小： | 5913K |
| 代理商： | ADUC836BS |
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ADuC836
–13–
MEMORY ORGANIZATION
The ADuC836 contains four different memory blocks:
62 Kbytes of On-Chip Flash/EE Program Memory
4 Kbytes of On-Chip Flash/EE Data Memory
256 bytes of General-Purpose RAM
2 Kbytes of Internal XRAM
(1) Flash/EE Program Memory
The ADuC836 provides 62 Kbytes of Flash/EE program
mem-
ory to run user code. The user can choose to run code from this
internal memory or run code from an external program memory.
If the user applies power or resets the device while the
EA
pin is
pulled low externally, the part will execute code from the external
program space; otherwise, if
EA
is pulled high externally, the part
defaults to code execution from its internal 62 Kbytes of Flash/EE
program memory.
Unlike the ADuC816, where code execution can overflow from the
internal code space to external code space once the PC becomes
greater than 1FFFH, the ADuC836 does not support the rollover
from F7FFH in internal code space to F800H in external code
space. Instead, the 2048 bytes between F800H and FFFFH will
appear as NOP instructions to user code.
Permanently embedded firmware allows code to be serially down-
loaded to the 62 Kbytes of internal code space via the UART serial
port while the device is in-circuit. No external hardware is required.
56
Kbytes
of the program memory can be reprogrammed during
runtime; thus the code space can be upgraded in the field
using a
user defined protocol or it can be used as a data
memory. This
is discussed in more detail in the Flash/EE
Memory section.
(2) Flash/EE Data Memory
4 Kbytes of Flash/EE Data Memory are available to the user and
can be accessed indirectly via a group of registers mapped into the
Special Function Register (SFR) area. Access to the Flash/EE Data
memory is discussed in detail in the Flash/EE Memory section.
(3) General-Purpose RAM
The general-purpose RAM is divided into two separate memories:
the upper and lower 128 bytes of RAM. The lower 128 bytes of
RAM can be accessed through direct or indirect addressing; the
upper 128 bytes of RAM can only be accessed through indirect
addressing as it shares the same address space as the SFR space,
which can only be accessed through direct addressing.
The lower 128 bytes of internal data memory are mapped as shown
in Figure 2. The lowest 32 bytes are grouped into four banks of
eight registers addressed as R0 through R7. The next 16 bytes
(128 bits), locations 20H through 2FH above the register banks,
form a block of directly addressable bit locations at bit addresses
00H through 7FH. The stack can be located anywhere in the inter-
nal memory address space, and the stack depth can be expanded
up to 2048 bytes.
Reset initializes the stack pointer to location 07H. Any call or push
pre-increments the SP before loading the stack. Therefore, loading
the stack starts from location 08H, which is also the first register
(R0) of register bank 1. Thus, if one is going to use more than one
register bank, the stack pointer should be initialized to an area of
RAM not used for data storage.
BIT-ADDRESSABLE
(BIT ADDRESSES)
FOUR BANKS OF EIGHT
REGISTERS
R0–R7
BANKS
SELECTED
VIA
BITS IN PSW
11
10
01
00
07H
0FH
17H
1FH
2FH
7FH
00H
08H
10H
18H
20H
RESET VALUE OF
STACK POINTER
30H
GENERAL-PURPOSE
AREA
Figure 2. Lower 128 Bytes of Internal Data Memory
(4) Internal XRAM
The ADuC836 contains 2 Kbytes of on-chip extended data mem-
ory. This memory, although on-chip, is accessed via the MOVX
instruction. The 2 Kbytes of internal XRAM are mapped into the
bottom 2 Kbytes of the external address space if the CFG836.0
bit is set. Otherwise, access to the external data memory will occur
just like a standard 8051.
Even with the CFG836.0 bit set, access to the external XRAM
will occur once the 24-bit DPTR is greater than 0007FFH.
EXTERNAL
DATA
MEMORY
SPACE
(24-BIT
ADDRESS
SPACE)
000000H
FFFFFFH
CFG836.0 = 0
EXTERNAL
DATA
MEMORY
SPACE
(24-BIT
ADDRESS
SPACE)
000000H
FFFFFFH
CFG836.0 = 1
0007FFH
000800H
2 KBYTES
ON-CHIP
XRAM
Figure 3. Internal and External XRAM
GENERAL NOTES PERTAINING TO THIS DATA SHEET
1. SET implies a Logic 1 state and CLEARED implies a Logic 0 state, unless
otherwise stated.
2. SET and CLEARED also imply that the bit is set or automatically cleared by
the ADuC836 hardware, unless otherwise stated.
3. User software should not write 1s to reserved or unimplemented bits as they
may be used in future products.
4. Any pin numbers used throughout this data sheet refer to the 52-lead MQFP
package, unless otherwise stated.
REV. A
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADUC836BS | 制造商:Analog Devices 功能描述:IC SEMICONDUCTOR ((NS)) |
| ADUC836BSZ | 功能描述:IC ADC DUAL 16BIT W/MCU 52-MQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| ADUC841 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| ADUC841BCP32-5 | 制造商:Analog Devices 功能描述:MICROCONVERTER 1-CYCLE VERSION ADUC829 - Trays |
| ADUC841BCP62-3 | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 20MHZ 3.3V 56LFCSP - Bulk |
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