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参数资料
| 型号： | P83CL781 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Low voltage 8-bit microcontrollers with UART and I2C-bus |
| 中文描述： | 低电压8 - UART及位微控制器的I2C总线 |
| 文件页数： | 12/76页 |
| 文件大小： | 342K |
| 代理商： | P83CL781 |
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1997 Mar 14
12
Philips Semiconductors
Product specification
Low voltage 8-bit microcontrollers with
UART and I
2
C-bus
P83CL781; P83CL782
9
MEMORY ORGANIZATION
The P83CL78x has a 16 kbyte Program Memory (ROM)
plus 256 bytes of Data Memory (RAM) on-chip. The device
has separate address spaces for Program and Data
Memory (see Fig.6). Using Ports P0 and P2, the
P83CL78x can address up to 128 kbytes of external
memory. The CPU generates both read (RD) and write
(WR) signals for external Data Memory accesses, and the
read strobe (PSEN) for external Program Memory.
9.1
Program memory
The P83CL78x contains 16 kbytes of internal ROM. After
reset the CPU begins execution at location 0000H.
The lower 16 kbytes of Program Memory can be
implemented in either on-chip ROM or external memory.
If the EA pin is strapped to V
DD
, then Program Memory
fetches from addresses 0000H through to 3FFFH are
directed to the internal ROM. Fetches from addresses
4000H through to FFFFH are directed to external ROM.
Program Counter values greater than 3FFFH are
automatically addressed to external memory regardless of
the state of the EA pin.
9.2
Data memory
The P83CL78x contains 256 bytes of internal RAM and
34 Special Function Registers (SFRs). The memory map
(Fig.6 ) shows the internal Data Memory space divided into
the lower 128 bytes, the upper 128 bytes and the SFR
space. Internal RAM locations 0 to 127 are directly and
indirectly addressable. Internal RAM locations 128 to 255
are only indirectly addressable. The Special Function
Register locations 128 to 255 bytes are only directly
addressable.
9.3
Special Function Registers
The upper 128 bytes are the address locations of the
Special Function Registers. Figures 7 and 8 show the
Special Function Registers space. The SFRs include the
port latches, timers, peripheral control, serial I/O registers,
and so on. These registers can only be accessed by direct
addressing. There are 128 addressable locations in the
SFR address space (SFRs with addresses divisible by
eight).
9.4
Addressing
The P83CL78x has five methods for addressing source
operands:
Register
Direct
Register-indirect
Immediate
Base-register plus index-register-indirect.
The first three methods can be used for addressing
destination operands. Most instructions have a
‘destination/source’ field that specifies the data type,
addressing methods and operands involved.
For operations other than MOVs, the destination operand
is also a source operand.
Fig.5 The lower 128 bytes of internal RAM.
alfpage
MLA560 - 1
R7
R0
07H
0
R7
R0
0FH
08H
R7
R0
17H
10H
R7
R0
1FH
18H
2FH
7FH
20H
30H
bit-addressable space
(bit addresses 0 to 7F)
4 banks of 8 registers
(R0 to R7)
相关PDF资料 |
PDF描述 |
|---|---|
| P83CL781HFH | Low voltage 8-bit microcontrollers with UART and I2C-bus |
| P83CL781HFP | Low voltage 8-bit microcontrollers with UART and I2C-bus |
| P83CL782 | Low voltage 8-bit microcontrollers with UART and I2C-bus |
| P83CL782HDH | Low voltage 8-bit microcontrollers with UART and I2C-bus |
| P83CL782HDP | Low voltage 8-bit microcontrollers with UART and I2C-bus |
相关代理商/技术参数 |
参数描述 |
|---|---|
| P83CL781HDH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low voltage 8-bit microcontrollers with UART and I2C-bus |
| P83CL781HFB | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P83CL781HFH | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low voltage 8-bit microcontrollers with UART and I2C-bus |
| P83CL781HFN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| P83CL781HFP | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Low voltage 8-bit microcontrollers with UART and I2C-bus |
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