C8051F709-GQR Silicon Labs, C8051F709-GQR Datasheet - Page 164

• Manufacturer Part Number: C8051F709-GQR
• Description: 8-bit Microcontrollers - MCU 8kB 32B EEPROM Cap Sense
• Manufacturer: Silicon Labs

Specifications of C8051F709-GQR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

C8051F70x/71x
25.1. Power-On Reset
During power-up, the device is held in a reset state and the RST pin is driven low until V
V
increases (V
power-on and V
cause the device to be released from reset before V
1 ms, the power-on reset delay (T
On exit from a power-on reset, the PORSF flag (RSTSRC.1) is set by hardware to logic 1. When PORSF is
set, all of the other reset flags in the RSTSRC Register are indeterminate (PORSF is cleared by all other
resets). Since all resets cause program execution to begin at the same location (0x0000) software can
read the PORSF flag to determine if a power-up was the cause of reset. The content of internal data mem-
ory should be assumed to be undefined after a power-on reset. The V
power-on reset.
164
RST
Logic HIGH
Logic LOW
. A delay occurs before the device is released from reset; the delay decreases as the V
DD
ramp time is defined as how fast V
DD
RST
monitor reset timing. The maximum V
Figure 25.2. Power-On and V
V
RST
Power-On
PORDelay
Reset
T
) is typically less than 10 ms.
PORDelay
Rev. 1.0
DD
DD
DD
reaches the V
ramps from 0 V to V
DD
Monitor Reset Timing
ramp time is 1 ms; slower ramp times may
Monitor
Reset
RST
VDD
DD
level. For ramp times less than
monitor is enabled following a
RST
). Figure 25.2. plots the
DD
V
settles above
DD
DD
ramp time
t