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SM5M2 Datasheet(PDF) 18 Page - Sharp Corporation

Part # SM5M2
Description  4-Bit Single-Chip Microcomputer(LCD Driver)
PDF  28 Pages
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

SM5M2 Datasheet(HTML) 18 Page - Sharp Corporation

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SM5M2
- 18 -
Standby Function
A standby function is available which temporarily
stops
program
execution
to
conserve
power
consumption. The state during which a program is in
execution is called the operation mode and the state
during which the execution is temporarily stopped is
called the standby mode.
Either CR or X' TAL oscillator can be selected to a
system clock generator circuit of SM5M2. Each
standby mode between CR + X' TAL and only X' TAL
is entirely different as tables shown below.
In case of CR + X'TAL oscillator, HALT instruction can
NOT be used, only STOP instruction is available.
On the other hand, in case of only X' TAL oscillator,
both HALT and STOP instruction are available.
STATUS
CRSTOP1
CRSTOP2
CRSTOP3
0
1
0
OFF
ON
OFF
OFF
ON
ON
0
0
0
OFF
ON
OFF
OFF
OFF
ON
0
0
1
OFF
ON
OFF
OFF
OFF
OFF
1
1
1
NOTES :
• When CR = OFF, CPU and Voice are OFF.
• When Divider = OFF, neither LCD nor Melody is in operation (undefined).
• STOP = 1 stands for executing STOP instruction.
Table 4 CR + X'TAL Standby Mode
STOP
HALT
P33
RF1
RD2
CR
Standby mode
Register status
Chip's status
X'TAL
CPU
Voice
LCD
Divider
STATUS
XTALHALT1
XTALHALT2
XTALHALT3
XTALSTOP
1
0
1
0
OFF
ON
OFF
OFF
ON
ON
1
0
0
0
OFF
ON
OFF
OFF
OFF
ON
1
0
0
0
1
OFF
ON
OFF
OFF
OFF
OFF
0
0
0
0
0
0
OFF
OFF
OFF
OFF
OFF
OFF
1
NOTES :
• When CR = OFF, CPU and Voice are OFF.
• When Divider = OFF, neither LCD nor Melody is in operation (undefined).
• STOP = 1 stands for executing STOP instruction.
• HALT = 1 stands for executing HALT instruction.
Table 5 Only X'TAL Standby Mode
STOP
HALT
P33
RF1
RD2
CR
Standby mode
Register status
Chip's status
X'TAL
CPU
Voice
LCD
Divider
To get a condition mentioned in the first to the sixth
boxes from right hand side, one of STOP or HALT
instruction must be executed under the condition
mentioned in the fourth to the sixth boxes from left
hand side.
For instance, to get the status of XTALHALT1, of which
contents are CR = OFF, X' TAL = ON, CPU = OFF,
Voice = OFF, LCD = ON, and Divider = ON in the only
X' tal standby mode, HALT instruction must be
executed under the condition of P33 = 0, RF1 = 1 and
RD2 = 0.
NOTE :
The halt mode stops only system clock generator circuit.
This mode is used to activate the system immediately after
a condition causes a release to the operation mode.



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