HMS87C5216 ETC1 [List of Unclassifed Manufacturers], HMS87C5216 Datasheet - Page 67

• Manufacturer Part Number: HMS87C5216
• Description: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

17.3 Low Voltage Detection Mode
(1) Low voltage detection condition
An on board voltage comparator checks that VDD is at the re-
quired level to ensure correct operation of the device. If VDD is
below a certain level, Low voltage detector forces the device into
low voltage detection mode.
(2) Low Voltage Detection Mode
There is no power consumption except stop current, stop mode
release function is disabled. All I/O port is configured as input
mode and Data memory is retained until voltage through external
SEP. 2004 Ver 1.01
Figure 17-3 Oscillator stabilization diagram
Figure 17-4 Reset Timing by Diagram
VDD
INTERNAL
RESET
ADDR. BUS
OSC. START TIMING
DATA BUS
INTERNAL
RESET
PRESCALER COUNT START
SP
SP-1
capacitor is worn out. In this mode, all port can be selected with
Pull-up resistor by Mask option. If there is no information on the
Mask option sheet ,the default pull up option (all port connect to
pull-up resistor ) is selected.
(3) Release of Low Voltage Detection Mode
Reset signal result from new battery(normally 3V) wakes the low
voltage detection mode and come into normal reset state. It de-
pends on user whether to execute RAM clear routine or not.
SP-2
FE
FFFE FFFF NEW PC
VECTOR
LSB
MSB
VECTOR
HMS87C5216