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| 型号： | M38049FFLSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 16.8 MHz, MICROCONTROLLER, PDIP64 |
| 封装： | 17 X 56.40 MM, 1.78 MM HEIGHT, PLASTIC, SDIP-64 |
| 文件页数： | 9/129页 |
| 文件大小： | 1721K |
| 代理商： | M38049FFLSP |
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Rev.1.00
Oct 27, 2008
Page 106 of 128
REJ03B0266-0100
3804 Group (Spec.L)
NOTES
NOTES ON PROGRAMMING
1. Processor Status Register
(1) Initializing of processor status register
Flags which affect program execution must be initialized after a reset.
In particular, it is essential to initialize the T and D flags because
they have an important effect on calculations.
<Reason>
After a reset, the contents of the processor status register (PS) are
undefined except for the I flag which is “1”.
Fig. 101 Initialization of processor status register
(2) How to reference the processor status register
To reference the contents of the processor status register (PS),
execute the PHP instruction once then read the contents of (S+1).
If necessary, execute the PLP instruction to return the PS to its
original status.
Fig. 102 Stack memory contents after PHP instruction
execution
2. Decimal calculations
(1) Execution of decimal calculations
The ADC and SBC are the only instructions which will yield
proper decimal notation, set the decimal mode flag (D) to “1”
with the SED instruction. After executing the ADC or SBC
instruction, execute another instruction before executing the
SEC, CLC, or CLD instruction.
(2) Notes on status flag in decimal mode
When decimal mode is selected, the values of three of the flags in
the status register (the N, V, and Z flags) are invalid after a ADC
or SBC instruction is executed.
The carry flag (C) is set to “1” if a carry is generated as a result of the
calculation, or is cleared to “0” if a borrow is generated. To
determine whether a calculation has generated a carry, the C flag
must be initialized to “0” before each calculation. To check for a
borrow, the C flag must be initialized to “1” before each calculation.
Fig. 103 Execution of decimal calculations
3. JMP instruction
When using the JMP instruction in indirect addressing mode, do
not specify the last address on a page as an indirect address.
4. Multiplication and Division Instructions
The index X mode (T) and the decimal mode (D) flags do not
affect the MUL and DIV instruction.
The execution of these instructions does not change the
contents of the processor status register.
5. Ports
The contents of the port direction registers cannot be read. The
following cannot be used:
The data transfer instruction (LDA, etc.)
The operation instruction when the index X mode flag (T) is “1”
The instruction with the addressing mode which uses the value
of a direction register as an index
The bit-test instruction (BBC or BBS, etc.) to a direction
register
The read-modify-write instructions (ROR, CLB, or SEB, etc.)
to a direction register.
Use instructions such as LDM and STA, etc., to set the port
direction registers.
6. Instruction Execution Timing
The instruction execution time can be obtained by multiplying
the frequency of the internal clock
φ by the number of cycles
mentioned in the 740 Family Software Manual.
The frequency of the internal clock
φ is the twice the XIN cycle in
high-speed mode, 8 times the XIN cycle in middle-speed mode,
and the twice the XCIN in low-speed mode.
Reset
Initializing of flags
Main program
Stored PS
(S)
(S) + 1
Set D flag to “1”
ADC or SBC instruction
NOP instruction
SEC, CLC, or CLD instruction
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