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| 型號： | ADUC836BCPZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 60/80頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 62K FLASH ADC/DAC 56LFCSP |
| 標準包裝： | 2,500 |
| 系列： | MicroConverter® ADuC8xx |
| 核心處理器： | 8052 |
| 芯體尺寸： | 8-位 |
| 速度： | 12.58MHz |
| 連通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外圍設(shè)備： | POR，PSM，PWM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 34 |
| 程序存儲器容量： | 62KB（62K x 8） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 4K x 8 |
| RAM 容量： | 2.25K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.25 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 7x16b; D/A 1x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 56-VFQFN 裸露焊盤，CSP |
| 包裝： | 帶卷 (TR) |
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ADuC836
–62–
ADuC836
–63–
ADuC836 HARDWARE DESIGN CONSIDERATIONS
This section outlines some of the key hardware design consider-
ations that must be addressed when integrating the ADuC836
into any hardware system.
External Memory Interface
In addition to its internal program and data memories, the
ADuC836 can access up to 64 Kbytes of external program memory
(ROM, PROM, and so on) and up to 16 Mbytes of external data
memory (SRAM).
To select from which code space (internal or external program
memory) to begin executing code, tie the EA (external access)
pin high or low, respectively.When EA is high (pulled up to VDD),
user program execution will start at Address 0 in the internal
62 Kbytes Flash/EE code space.When EA is low (tied to ground)
user program execution will start at Address 0 in the external
code space.When executing from internal code space, accesses
to the program space above F7FFH (62 Kbytes) will be read as
NOP instructions.
Note that a second very important function of the EA pin is
described in the Single Pin Emulation Mode section.
External program memory (if used) must be connected to the
ADuC836, as illustrated in Figure 58. Sixteen I/O lines (Ports 0
and 2) are dedicated to bus functions during external program
memory fetches. Port 0 (P0) serves as a multiplexed address/data
bus. It emits the low byte of the program counter (PCL) as
an address, and then goes into a high impedance input state
awaiting the arrival of the code byte from the program memory.
During the time that the low byte of the program counter is valid
on P0, the signal ALE (Address Latch Enable) clocks this byte
into an external address latch. Meanwhile, Port 2 (P2) emits the
high byte of the program counter (PCH), and PSEN strobes the
EPROM and the code byte is read into the ADuC836.
LATCH
EPROM
OE
A8–A15
A0–A7
D0–D7
(INSTRUCTION)
ADuC836
PSEN
P2
ALE
P0
Figure 58. External Program Memory Interface
Note that program memory addresses are always 16 bits wide,
even in cases where the actual amount of program memory used
is less than 64 Kbytes. External program execution sacrifices
two of the 8-bit ports (P0 and P2) to the function of addressing
the program memory.While executing from external program
memory, Ports 0 and 2 can be used simultaneously for read/write
access to external data memory, but not for general-purpose I/O.
Though both external program memory and external data memory
are accessed using some of the same pins, the two are completely
independent of each other from a software point of view. For
example, the chip can read/write external data memory while
executing from external program memory.
Figure 59 shows a hardware configuration for accessing up to
64 Kbytes of external data memory.This interface is standard to
any 8051 compatible MCU.
LATCH
SRAM
OE
A8–A15
A0–A7
D0–D7
(DATA)
ADuC836
RD
P2
ALE
P0
WE
WR
Figure 59. External Data Memory Interface
(64 Kbytes Address Space)
If access to more than 64 Kbytes of RAM is desired, a feature
unique to the MicroConverter allows addressing up to 16 Mbytes
of external RAM simply by adding an additional latch, as illus-
trated in Figure 60.
LATCH
ADuC836
RD
P2
ALE
P0
WR
LATCH
SRAM
OE
A8–A15
A0–A7
D0–D7
(DATA)
WE
A16–A23
Figure 60. External Data Memory Interface
(16 Mbytes Address Space)
In either implementation, Port 0 (P0) serves as a multiplexed
address/data bus. It emits the low byte of the data pointer (DPL)
as an address, which is latched by ALE prior to data being placed
on the bus by the ADuC836 (write operation) or by the external
data memory (read operation). Port 2 (P2) provides the data
pointer page byte (DPP) to be latched by ALE, followed by the
data pointer high byte (DPH). If no latch is connected to P2,
DPP is ignored by the SRAM, and the 8051 standard of 64 Kbyte
external data memory access is maintained.
Detailed timing diagrams of external program and data memory
read and write access can be found in the Timing Specifications
section.
REV. A
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