Abov A96G166 - External Resetb Input; Figure 90. Timing Diagram after RESET; Figure 91. Oscillator Generating Waveform Example

18. Reset A96G166/A96A166/A96S166 User’s manual
176
18.3 External resetb input
External resetb is input to a Schmitt trigger. If the resetb pin is held with low for at least 10us over
within the operating voltage range and stable oscillation, it is applied and the internal state is
initialized. After reset state becomes ‘1’, it needs stabilization time with 16ms and after the stable
state, the internal reset becomes ‘1’. The reset process step needs 5 oscillator clocks. And the
program execution starts at the vector address stored at address 0000H.
Figure 90. Timing Diagram after RESET
Figure 91. Oscillator generating waveform example
As shown in Figure 91, the stable generating time is not included in the start-up time. The RESETB
pin has a pull-up register by hardware.
OSC
ADDRESS
BUS
CORE
BUS
Main Program
Stabilization Time
TST = 16.4ms
  


   
?
RESETB
Release
Internal
RESETB
Release
1
2
3
4
5
?
00
01
02
?
?
?
?
?
?
?
02
RESET Process
Step
OSC START TIMING
PRESCALER COUNT START
VDD