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参数资料
| 型号： | M38C80ED-XXXFP |
| 厂商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 40/51页 |
| 文件大小： | 874K |
| 代理商： | M38C80ED-XXXFP |
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40
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
NOTES ON PROGRAMMING
Processor Status Register
The contents of the processor status register (PS) after a reset are
undefined, except for the interrupt disable flag (I) which is
“
1.
”
After a
reset, initialize flags which affect program execution. In particular, it
is essential to initialize the index X mode (T) and the decimal mode
(D) flags because of their effect on calculations.
Interrupts
The contents of the interrupt request bits do not change immediately
after they have been written. After writing to an interrupt request reg-
ister, execute at least one instruction before performing a BBC or
BBS instruction.
Decimal Calculations
To calculate in decimal notation, set the decimal mode flag (D) to
“
1,
”
then execute an ADC or SBC instruction. After executing an
ADC or SBC instruction, execute at least one instruction before
executing a SEC, CLC, or CLD instruction.
In decimal mode, the values of the negative (N), overflow (V), and
zero (Z) flags are invalid.
Timers
If a value n (between 0 and 255) is written to a timer latch, the fre-
quency division ratio is 1/(n+1).
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.
Ports
The contents of the port direction registers cannot be read. The fol-
lowing cannot be used:
The data transfer instruction (LDA, etc.)
The operation instruction when the index X mode flag (T) is
“
1
”
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.
Serial I/O
In clock synchronous serial I/O, if the receive side is using an exter-
nal clock and it is to output the S
RDY
signal, set the transmit enable
bit, the receive enable bit, and the S
RDY
output enable bit to
“
1
”
.
Serial I/O continues to output the final bit from the TxD pin after trans-
mission is completed.
A-D Converter
The comparator is constructed linked to a capacitor. When the con-
version speed is not enough, the conversion accuracy might be ru-
ined by the disappearance of the charge. When A-D conversion is
performed in the middle-speed mode or the high-speed mode, set
f(X
IN
) to at least 500 kHz.
Do not execute the STP or WIT instruction during an A-D conversion
because a normal conversion result is not obtained.
Instruction Execution Time
The instruction execution time is obtained by multiplying the frequency
of the internal clock
φ
by the number of cycles needed to execute an
instruction.
The number of cycles required to execute an instruction is shown in
the list of machine instructions.
The frequency of the internal clock
φ
is half of the X
IN
frequency.
At STP Instruction Release
At the STP instruction release, all bits of the timer 12 mode register
are cleared.
LCD Control
When using the voltage multiplier, apply prescribed voltage to the
V
LIN
pin in the state in which the LCD enable bit is
“
0
”
, and set the
voltage multiplier enable bit to
“
1
”
.
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