參數(shù)資料
型號： M37641M8-XXXHP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁數(shù)： 142/149頁
文件大?。?/td> 1997K
代理商： M37641M8-XXXHP
142
7641 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
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.
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.
A
NOP
instruction must be executed after every
PLP
instruction.
A
SEI
instruction must be executed before every
PLP
instruction.
A
NOP
instruction must be executed before every
CLI
instruction.
BRK Instruction
It can be detected that the
BRK
instruction interrupt event or the
least priority interrupt event by referring the stored B flag state.
Refer to the stored B flag state in the interrupt routine.
Decimal Calculations
When decimal mode is selected, the values of the V flags are in-
valid.
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 de-
termine 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 calcula-
tion.
Multiplication and Division Instructions
The index X mode (T) and the decimal mode (D) flags do not af-
fect the MUL and DIV instruction.
Instruction Execution Time
The instruction execution time is obtained by multiplying the fre-
quency 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.
Timers
If a value n (between 0 and 255) is written to a timer latch, the
frequency division ratio is 1/(n+1).
P5
1
/X
COUT
/T
OUT
pin cannot function as an I/O port when X
CIN
-
X
COUT
is oscillating. When X
CIN
- X
COUT
oscillation is not used or
X
COUT
oscillation drive is disabled, this pin can function as the
T
OUT
output pin of the timer 1 or 2.
When using the T
OUT
output function and f(X
CIN
) divided by 2 is
used as the timer 1 count source (bit 2 of T123M = “1”), disable
X
COUT
oscillation drive (bit 5 of CCR = “1”).
Ports
When the data register (port latch) of an I/O port is modified with
the bit managing instruction (
SEB
,
CLB
instructions) the value of
the unspecified bit may be changed.
In standby state (the stop mode by executing the
STP
instruction,
and the wait mode by executing the
WIT
instruction) for low-
power dissipation, do not make input levels of an I/O port
“undefined”, especially for I/O ports of the P-channel and the N-
channel open-drain.
Pull-up (connect the port to Vcc) or pull-down (connect the port to
Vss) these ports through a resistor.
When determining a resistance value, note the following points:
(1) External circuit
(2) Variation of output levels during the ordinary operation
When using built-in pull-up or pull-down resistor, note on varied
current values.
(1) When setting as an input port : Fix its input level
(2) When setting as an output port : Prevent current from flowing
out to external
Serial I/O
Do not write to the serial I/O shift register during a transfer when in
SPI compatible mode.
UART
The all error flags PER, FER, OER and SER are cleared to “0”
when the UARTx status register is read, at the hardware reset or
initialization by setting the Transmit Initialization Bit. These flags
are also cleared to “0” by execution of bit test instructions such as
BBC
and
BCS
.
The transmission interrupt request bit is set and the interrupt re-
quest is generated by setting the transmit enable bit to “1” even
when selecting timing that either of the following flags is set to “1”
as timing where the transmission interrupt is generated:
(1) Transmit buffer empty flag is set to “1”
(2) Transmit complete flag is set to “1”.
Therefore, when the transmit interrupt is used, set the transmit in-
terrupt enable bit to transmit enabled as the following sequence:
(1) Transmit enable bit is set to “1”
(2) Transmit interrupt request bit is set to “0”
(3) Transmit interrupt enable bit is set to “1”.
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