EM6605 EM Microelectronic, EM6605 Datasheet - Page 21

• Manufacturer Part Number: EM6605
• Description: 4 bit Microcontroller
• Manufacturer: EM Microelectronic

10. Supply Voltage Level Detector (SVLD)
The EM6605 has a software configurable built-in supply voltage level detector. Three levels can be defined
between VDDmin + 100mV and VDDmax - 1000mV in steps of 100mV. During SLEEP mode this function is
disabled.
The required voltage compare level is selected by writing the bits VLC1 and VLC2 in the SVLD control register
which also activates the compare measurement. Since the measurement is not immediate the busy flag remains
high during the measurement and is automatically cleared low when the measurement is finished. The result is
indicated by inspection of the VLDR flag. If the result is 0 then the voltage level is higher than the selected compare
level. And if 1 is lower than the compare level.
The result VLDR of the last measurement remains until the new one is started. The start of a new measurement
resets the VLDR (SVLD result bit) to 0.
During
increases by approximately 3
ck[9] (~3.9msec with *f1). The measurement internally
starts with the rising ck[9] edge following the SVLD test
command. The additional SVLD consumption stops after
the falling edge of the ck[9] internal clock.
Table 33 lists the possible voltage levels
10.1. SVLD register
Table 34.SVLD control register - SVLD
Bit
3
2
1
0
the
SVLD
Name
VLDR
busy
VLC1
VLC0
operation
power
Reset
0
0
0
0
consumption
R/W
R
R
R/W
R/W
Table 33.SVLD level selection
Evaluation voltage
not active
SVLD result (0=higher 1=lower)
measurement in progress
SVLD level control 1
SVLD level control 0
Description
VL1 (low level)
VL2
VL3 (high level)
© EM Microelectonic-Marin SA, 02/99, Rev. B/243
1
0
0
1
VLC1
EM6605
VLC0
0
1
0
1
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