參數(shù)資料
型號(hào)： S3C70F2XX-SO
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO32
封裝： 0.450 INCH, SOP-32
文件頁(yè)數(shù)： 116/179頁(yè)
文件大?。?/td> 1070K
代理商： S3C70F2XX-SO
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S3C70F2/C70F4/P70F4
ADDRESSING MODES
3-5
SELECT BANK REGISTER (SB)
The select bank register (SB) is used to assign the memory bank and register bank. The 8-bit SB register consists
of the 4-bit select register bank register (SRB) and the 4-bit select memory bank register (SMB), as shown in
Figure 3-2.
SMB 3 SMB 2 SMB 1
SMB 0
0
SRB 1 SRB 0
SRB
SMB
SB
REGISTER
Figure 3-2. 4-Bit SMB and SRB Values in the SB Register
During interrupts and subroutine calls, SB register contents can be saved to stack in 8-bit units by the PUSH SB
instruction. You later restore the value to the SB using the POP SB instruction.
Select Register Bank (SRB) Instruction
The select register bank (SRB) value specifies which register bank is to be used as a working register bank. The
SRB value is set by the 'SRB n' instruction, where n = 0, 1, 2, 3. One of the four register banks is selected by the
combination of ERB flag status and the SRB value that you set using the 'SRB n' instruction. The current SRB
value is retained until another register is requested by program software.
PUSH SB and POP SB instructions are used to save and restore the contents of SRB during interrupts and
subroutine calls.
RESET clears the 4-bit SRB value to logic zero.
Select Memory Bank (SMB) Instruction
To select one of the three available data memory banks, you must execute an SMB n instruction specifying the
number of the memory bank you want (0, 1 or 15). For example, the instruction 'SMB 1' selects bank 1 and
'SMB 15' selects bank 15. You must also remember to enable the memory bank you select by the appropriate
enable memory bank flag (EMB) setting.
The upper four bits of the 12-bit data memory address are stored in the SMB register. If the SMB value is not
specified by software (or if a
RESET does not occur) the current value is retained. RESET clears the 4-bit SMB
value to logic zero.
PUSH SB and POP SB instructions save and restore the contents of the SMB register to and from the stack area
during interrupts and subroutine calls.
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