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參數(shù)資料
| 型號： | SDA20C440 |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PQFP80 |
| 封裝： | PLASTIC, MQFP-80 |
| 文件頁數(shù)： | 6/55頁 |
| 文件大?。?/td> | 990K |
| 代理商： | SDA20C440 |
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SDA 20C440
Semiconductor Group
14
Data Pointer Register (DPTR)
The 16-bit data pointer register DPTR is the concatenation of registers DPH (high-order byte) and
DPL (low-order byte). The DPTR is used in register-indirect addressing to move program memory
constants. DPTR may be manipulated as one 16-bit register or as two independent 8-bit registers
DPL and DPH.
Port 0, Port 1, Port 2
The three ports P0 ... 2 provide 10 I/O-lines to interface to the external world. Port 0 and Port 1 are
both byte and bit addressable. Port 2 is only byte addressable and contains two bits, which can be
selected as a serial interface and for normaly I/O. Port 0 is used for binary I/O. Port 1 contains up
to four ADC-input channels.
2.2
Memory Organization
2.2.1 Internal Program ROM
An internal program ROM of 4 Kbyte is provided. The ROM is mask-programmable. After reset, the
operation starts at address 0000H.
2.2.2
Internal Data RAM
An internal data RAM of 128 bytes of memory is provided. This internal RAM comprises
128 software flags, which are usable by the implemented bit operation instructions.
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