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SH79F3283
123
8.14 Warm-up Timer
8.14.1 Feature
Built-in power on warm-up counter to eliminate unstable state of power on
Built-in oscillator warm-up counter to eliminate unstable state when oscillation start up
SH79F3283 has a built-in power warm-up counter; it is designed to eliminate unstable state after power on or to do some
internal initial operation such as read internal customer code option etc.
SH79F3283 has also a built-in oscillator warm-up counter, it is designed to eliminate unstable state when oscillator starts
oscillating in the following conditions: Power-on reset, Pin reset, LVR reset, Watchdog Reset and Wake up from low power
consumption mode.
After power-on, SH79F3283 will start power warm-up procedure first, and then oscillator warm-up procedure. Begin to run the
program after the overflow.
Power Warm-up Time
Power On Reset/
Pin Reset/
Low Voltage Reset
WDT Reset
(Not in Power-Down Mode)
WDT Reset
(Wakeup from Power-Down
Mode)
Wakeup from Power-Down
Mode
(Only for interrupt)
TPWRT**
OSC
Warm up*
TPWRT**
OSC
Warm up*
TPWRT**
OSC
Warm up*
TPWRT**
OSC
Warm up*
11ms
YES
≈
1ms
NO
≈
1ms
YES
≈
500us
YES
OSC Warm-up Time
Option:
OP_WMT
Oscillator Type
00
01
10
11
Ceramic/Crystal
2
17
X Tosc
2
14
X Tosc
2
11
X Tosc
2
8
X Tosc
32kHz crystal
2
13
X Tosc
Internal RC
2
7
X Tosc