m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 369
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m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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STOP AND WAIT MODES
15.2 Block description
15-4
Fig. 15.2.2 Structure of particular function select register 0
15.2.1 Particular function select register 0
Figure 15.2.2 shows the structure of the particular function select register 0, and Figure 15.2.3 shows the
writing procedure for the particular function select register 0.
(1) STP instruction invalidity select bit (bit 0)
Particular function select register 0
Note: Writing to these bits requires the following procedure:
Setting this bit to “1” invalidates the STP instruction. When using the stop mode, be sure to clear this
bit to “0.”
Writing to this bit requires the following procedure:
• Write “55
• Succeedingly, write “0” or “1” to this bit. (See Figure 15.2.3.)
If an interrupt occurs between writing of “55
ignored. When there is a possibility that an interrupt occurs at the above timing, be sure to read this
bit’s contents after writing of “0” or “1,” and verify whether “0” or “1” has correctly been written or not.
7 to 2
Bit
0
1
• Write “55
• Succeedingly, write “0” or “1” to each bit.
Also, use the MOVMB (MOVM when m = 1) instruction or STAB (STA when m = 1) instruction.
If an interrupt occurs between writing of “55
possibility that an interrupt occurs at the above timing, be sure to read this bit’s contents after writing of “0” or “1,” and verify
whether “0” or “1” has correctly been written or not.
STP instruction invalidity select bit
External clcok input select bit
Fix these bits to “000000.”
16
16
” to address 62
” to this register. (The bit status does not change only by this writing.)
Bit name
16
.
(Address 62
7905 Group User’s Manual Rev.1.0
0 : STP instruction is valid.
1 : STP instruction is invalid.
0 : Oscillation circuit is active. (Oscillator is connected.)
1 : Oscillation circuit is inactive. (External clock is
16
” and next writing of “0” or “1,” latter writing may be ignored. When there is a
Watchdog timer is used at stop mode termination.
When the system clock select bit (bit 5 at address BC
watchdog timer is not used at stop mode termination.
When the system clock select bit = “1,”
watchdog timer is used at stop mode termination.
input.)
16
)
16
” and next writing of “0” or “1,” latter writing may be
Function
b7 b6 b5 b4 b3 b2 b1 b0
0
16
0
) = “0,”
0
0
At reset
0
0
0
0 0
(Note)
(Note)
R/W
RW
RW
RW
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