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CHAPTER 3 CPU AND CONTROL UNITS
■ Standby Control Register (STCR)
Figure 3.11-3 shows the configuration of the standby control register (STCR).
Figure 3.11-3 Configuration of Standby Control Register (STCR) Bits
Address:00000481
Initial value (INIT pin)
Initial value (HSTX)
Initial value (INIT)
Initial value (RST)
*: Occurs only at the same time as initialization due to the INIT pin.
The standby control register controls the operating mode of the device.
This register controls the transition to the two standby modes of stop and sleep, pins when in stop
mode, and the stopping of oscillation stop. It also sets the oscillation stabilization wait time and
issues software resets.
The following describes the functions of the standby control register (STCR) bits.
[bit7] STOP (STOP mode)
This bit specifies entry into stop mode. If 1 is written to both bit6 (SLEEP bit) and this bit, this
bit has precedence and the device enters stop mode
0
1
•
This bit is initialized to 0 by a reset (RST) and by a stop return source.
•
This bit is readable and writable.
[bit6] SLEEP (SLEEP mode)
This bit specifies entry into stop mode. If 1 is written to both bit7 (STOP bit) and this bit, this
bit (STOP) has precedence and the device enters stop mode.
0
1
•
This bit is initialized to 0 by a reset (RST) and by a sleep return source.
•
This bit is readable and writable.
86
bit
7
6
STOP SLEEP HIZ
H
R/W
R/W
0
0
*
0
0
0
0
0
0
Otherwise, the same as INIT.
Stop mode not entered (initial value)
Stop mode entered
Sleep mode not entered (initial value)
Sleep mode entered
5
4
3
2
SRST OS1
OS0 OSCD2 OSCD1
R/W
R/W
R/W
R/W
1
1
0
0
1
1
1
1
1
1
x
x
x
1
x
x
1
0
R/W
R/W
1
1
1
1
1
1
x
x
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