Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 47

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

PS024604-1005
Internal Precision
Internal RESET
System Clock
V
CC
Oscillator
Power-On Reset
Voltage Brown-Out Reset
= 0.0V
Signal
V
V
POR
VBO
Each device in the Z8FMC16100 Series Flash MCU contains an internal Power-On Reset
(POR) circuit. The POR circuit monitors the supply voltage and holds the device in the
Reset state until the supply voltage reaches a safe operating level. After the supply voltage
exceeds the POR voltage threshold (V
and counts 50 cycles of the Internal Precision Oscillator. At this point the System Clock is
enabled and the POR Counter counts a total of 16 system clock pulses. The device is held
in the Reset state until this second POR Counter sequence has timed out. After the
Z8FMC16100 Series Flash MCU exits the Power-On Reset state, the eZ8 CPU fetches the
Reset vector. Following Power-On Reset, the POR status bit in the
trol Register
Figure 3 illustrates Power-On Reset operation. Refer to the
DC Electrical Characteristics
(V
The Z8FMC16100 Series Flash MCU provides low Voltage Brown-Out (VBO) protection.
The VBO circuit senses when the supply voltage drops to an unsafe level (below the VBO
POR
).
is set to 1.
Oscillator
Startup
Figure 3. Power-On Reset Operation
P R E L I M I N A R Y
section on page 265
Counter Delay
Option Bit
POR
) and has stabilized, the POR Counter is enabled
Counter Delay
System Clock
for the POR threshold voltage
On-Chip Peripheral AC and
Product Specification
Reset Status and Con-
Program Execution
Power-On Reset
V
CC
= 3.3V
25