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SZF2002 Datasheet(PDF) 11 Page - NXP Semiconductors |
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SZF2002 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 76 page  1998 Aug 26 11 Philips Semiconductors Product specification Low voltage 8-bit microcontroller with 6-kbyte embedded RAM SZF2002 9 MEMORY ORGANIZATION The SZF2002 has 6 kbytes of program memory plus 6 kbytes + 256 bytes of data memory on chip. The device has separate address spaces for program and data memory (see Fig.4). The SZF2002 can directly address up to 256 kbytes of external data memory. The CPU generates the read strobe (OE), the write strobe (WE) and chip select (CE) for external program memory (Flash), and read strobe (OE) and write strobe (WE) and chip select (RAMCE) for external data memory. 9.1 Program memory The SZF2002 contains 6 kbytes of internal ROM and 6144 + 256 bytes of RAM. The lower 6 kbytes of program memory can be implemented in either on-chip ROM or external program memory. The 6 kbytes of program memory is implemented as mask programmable ROM. There are two modes for the program memory, depending on the state of the EA pin (latched during reset) and on the address range: 1. EA = 0. All program fetches are directed to the external program memory. After reset the CPU begins execution at location 8000H. 2. EA = 1. After reset the CPU begins execution at location 0000H. Fetches from addresses 2000H to 37FFH are redirected to the Auxiliary RAM. The processor can fill this RAM with normal write operations to the data memory (MOVX to addresses 0000H to 17FFH). Program memory fetches from addresses 0000H to 17FFH are directed to the internal ROM. Program Counter values greater than 7FFFH are automatically addressed to external memory regardless of the state of the EA pin. 9.2 Data memory The SZF2002 contains 6144 + 256 bytes of RAM and a number of Special Function Registers (SFRs). All these data spaces are addressed differently. Figure 4 shows the internal data memory space divided into the lower 128 bytes, the upper 128 bytes, Auxiliary RAM, and the SFRs space. Internal RAM locations 0 to 127 are directly and indirectly addressed. Internal RAM locations 128 to 255 are only indirectly addressed. The Special Function Register locations 128 to 255 are only directly addressed. Auxiliary RAM is accessible via MOVX instructions to the lower 32-kbyte address space. MOVX @R0/R1 instructions use SFR P2 as page selector. The upper 32-kbyte address space is redirected to the program memory, to accommodate flash programming. 9.3 Special Function Registers (SFRs) The upper 128 bytes are the address locations of the SFRs. Figures 6 and 7 show the Special Function Registers space. The SFRs include the port latches, timers, peripheral control, serial I/O registers, etc. These registers are accessed by direct addressing. There are 128 directly addressed locations in the SFR address space. Bit addressed SFRs are those that end in 000B. 9.4 Addressing The SZF2002 has five methods for addressing source operands: • Register • Direct • 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. Access to memory addressing is as follows: • Registers in one of the four register banks through Direct or Indirect (see Fig.5) • Lower 128 bytes of internal RAM through Direct or register Indirect; upper 128 bytes of internal RAM through Indirect • Special Function Registers through Direct • Program memory look-up tables through Base-Register plus Index-Register-Indirect • Extended data memory access through register Indirect. |
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