ST62E40B STMICROELECTRONICS [STMicroelectronics], ST62E40B Datasheet - Page 52

• Manufacturer Part Number: ST62E40B
• Description: 8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST62T40B/E40B
4.6 POWERSUPPLY SUPERVISOR DEVICE (PSS)
The Power Supply Supervisor device, described in
the Figure 32, permits supervising the crossing of
the PSS pin voltage (VPSS) through a program-
mable voltage (mxV
chosen by software. This device includes:
– An internal comparator which is connected to the
– 2 resistive voltage dividers that are, respectively,
– An internal device that allows the detection with
The PSS device is supplied by an internal connec-
tion to V
scribe the operating mode of the PSS device and
the PSS register that permits control over the PSS
device. The PSS device is switched off as soon as
the Core executes the STOP instruction, but con-
tinues to work in the WAIT mode.
Figure 32. PSS Device Block Diagram
52/72
52
internal INT line to make an interrupt request to
the Core.
supplied by the PSS pin and the V
two voltage dividers are both connected to the
two inputs of the internal comparator. They con-
sist of 13 identical resistors. It is possible to se-
lect by software 5 voltage rates on the PSS
divider (nxVPSS/13) and 4 voltage rates on the
V
be chosen by software. These two voltage divid-
ers are disconnected in STOP mode, and when
the PSS device is OFF.
an hysteresis of V
INTERRUPT LINE
DD
divider (mxV
DD
PIF
supply. The following paragraphs de-
DD
DD
DD
/13). The n and m values can
/13.
/n), where n and m can be
PSS ON
SEQUENCER
SYNCHRO
& LOGIC
DD
pin. These
Figure 31. PSS Device Operating Modes
Description
+
-
(m+1)x/V
mx/V
DD
VPSS
2k
DD
2k
/13
/13
PIF
1
0
(UP to 13 STEPS)
(UP to 13 STEPS)
nxVPSS/13
VR02044A
VA0060
PSS
V
DD
t
t