SN8P2318 Series
C-type LCD, RFC 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 50
Version 1.5
4.7 SYSTEM CLOCK TIMING
Parameter
Symbol
Description
Typical
Hardware configuration time
Tcfg
2048*F
ILRC
.
(The hardware configuration time clock source is internal
low-speed RC oscillator whose frequency is 16KHz @3V,
32KHz @5V)
64ms @ F
ILRC
= 32KHz
128ms @ F
ILRC
= 16KHz
Oscillator start up time
Tost
The start-up time is depend
ed on oscillator’s material,
factory and architecture. The RC typ
e oscillator’s start-up
time is very short and ignored.
-
Oscillator warm-up time
Tosp
Oscillator warm-up time of reset condition (Power on
reset, LVD reset, watchdog reset, external reset pin
active and wake-up from power down mode):
External high-speed crystal 4M/12M modes:
2048*F
hosc
(Reset modes).
External high-speed crystal 4M/12M modes:
2560*F
hosc
(Wake-up modes)
External high-speed RC modes: 32*F
hosc
External low-speed 32KHz crystal mode: (2
14
+256)*F
losc
External low-speed RC modes: 32*F
losc
Internal PLL 16MHz oscillator warm-up time is external
low-speed oscillator warm-up time + 256 low-speed
clock.
ex.
PLL 16MHz in external low-speed crystal mode: (2
14
+256)*F
losc
PLL 16MHz in external low-speed RC mode: 288*F
losc
High-speed oscillator:
8us @ F
hosc
= 4MHz RC
128us @ F
hosc
= 16MHz X
’tal
(Reset modes)
512us @ F
hosc
= 4MHz X
’tal
(Reset modes)
160us @ F
hosc
= 16MHz X
’tal
(Wake-up modes)
640us @ F
hosc
= 4MHz X
’tal
(Wake-up modes)
Low-speed oscillator:
0.52sec @ F
losc
= 32KHz
X
’tal
1ms @ F
losc
= 32KHz RC
PLL 16MHz:
0.52sec @ F
losc
= 32KHz
X
’tal
9ms @ F
losc
= 32KHz RC
Power On Reset Timing
Vdd
Power On Reset
Flag
Oscillator
Fcpu
(Instruction Cycle)
Tcfg
Tost
Tosp
Vp
External Reset Pin Reset Timing
External Reset Pin
Oscillator
Fcpu
(Instruction Cycle)
Tcfg
Tost
Tosp
Reset pin falling edge trigger system reset.
Reset pin returns to high status.
System is under reset
status.
External Reset
Flag