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參數(shù)資料
| 型號(hào)： | S3C70F4XX-AV |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDIP30 |
| 封裝： | 0.400 INCH, SDIP-30 |
| 文件頁(yè)數(shù)： | 94/179頁(yè) |
| 文件大?。?/td> | 1070K |
| 代理商： | S3C70F4XX-AV |
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ADDRESS SPACES
S3C70F2/C70F4/P70F4
2-8
Memory Banks 0, 1 and 15
Bank 0
(000H–0FFH)
The lowest 32 nibbles of bank 0 (000H–01FH) are used as working registers;
the next 224 nibbles (020H–0FFH) can be used both as stack area and as
general-purpose data memory. Use the stack area for implementing subroutine
calls and returns, and for interrupt processing.
Bank 1
(100H–1FFH)
This area is used as general-purpose data memory.
Bank 15
(F80H–FFFH)
The microcontroller uses bank 15 for memory-mapped peripheral I/O. Fixed
RAM locations for each peripheral hardware register are mapped into this area.
Data Memory Addressing Modes
The enable memory bank (EMB) flag controls the addressing mode for data memory banks 0 or 15. When the
EMB flag is logic zero, the addressable area is restricted to specific locations, depending on whether direct or
indirect addressing is used. With direct addressing, you can access locations 000H–07FH of bank 0, bank 1 and
bank 15. With indirect addressing, only bank 0 (000H–0FFH) can be accessed. When the EMB flag is set to logic
one, all three data memory banks can be accessed according to the current SMB value.
For 8-bit addressing, two 4-bit registers are addressed as a register pair. When using 8-bit instructions to address
RAM locations, remember to use the even-numbered register address as the instruction operand.
Working Registers
The RAM working register area in data memory bank 0 is further divided into four register banks (bank 0, 1, 2,
and 3). Each register bank has eight 4-bit registers and paired 4-bit registers are 8-bit addressable.
Register A is used as a 4-bit accumulator and register pair EA is an 8-bit extended accumulator. The carry flag
bit can also be used as a 1-bit accumulator. Register pairs WX, WL, and HL are used as address pointers for
indirect addressing. To limit the possibility of data corruption due to incorrect register addressing, it is advisable
to use register bank 0 for the main program and banks 1, 2, and 3 for interrupt service routines.
Bit Sequential Carrier (BSC)
The bit sequential carrier (BSC) is a 16-bit general register mapped to RAM addresses FC0H–FC3H that can be
manipulated by 1-, 4-, and 8-bit RAM control instructions.
RESET clears all bit values to logic zero.
You can specify addresses and bit locations sequentially using a 1-bit indirect addressing instruction. In this way,
a program can process 16-bit data by moving the bit location sequentially, incrementing or decrementing the
value of the L register. BSC data can also be manipulated by direct addressing. For 8-bit manipulations, you
must address the upper and lower 8 bits separately.
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| S3P7414XX-QZ | 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP44 |
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