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PIC16(L)F1508/9
DS40001609E-page 66
2011-2015 Microchip Technology Inc.
FIGURE 6-3:
RESET START-UP SEQUENCE
Note 1:
Code execution begins 10 F
OSC
cycles after the F
OSC
clock is released.
External Oscillators , PWRTEN =
1
, IESO =
1
code execution
(1)
External Oscillators , PWRTEN =
0
, IESO = 1
Ext. Oscillator
Osc Start-Up Timer
T
OST
T
PWRT
T
OST
V
DD
Internal POR
Internal RESET
MCLR
F
OSC
Begin Execution
Power-up Timer
Int. Oscillator
code execution
(1)
External Oscillators , PWRTEN =
1
, IESO =
0
code
execution
(1)
External Oscillators , PWRTEN =
0
, IESO =
0
Ext. Oscillator
Osc Start-Up Timer
code
execution
(1)
T
OST
T
PWRT
T
OST
V
DD
Internal POR
Internal RESET
MCLR
F
OSC
Begin Execution
Power-up Timer
V
DD
Internal POR
External Clock (EC modes), PWRTEN =
0
Internal RESET
MCLR
F
OSC
Begin Execution
Ext. Clock (EC)
Power-up Timer
External Clock (EC modes), PWRTEN =
1
code execution
(1)
code execution
(1)
T
PWRT
Int. Oscillator
code execution
(1)
Internal Oscillator, PWRTEN =
0
Internal Oscillator, PWRTEN =
1
code execution
(1)
T
PWRT
V
DD
Internal POR
Internal RESET
MCLR
F
OSC
Begin Execution
Power-up Timer
Rev. 10-000032A
7/30/2013