sh66k33a SinoWealth Micro-Electronics Corp. Ltd, sh66k33a Datasheet - Page 14

• Manufacturer Part Number: sh66k33a
• Description: Mask 1k 4-bit Micro-controller
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

13. Warm-up Timer
The device has a built-in warm-up timer to eliminate unstable state of initial oscillation when oscillator starts oscillating in the
following conditions:
13.1. Power-on Reset
Warm-up time interval:
(1) In Internal RC oscillator mode, f
(2) In Crystal oscillator or Ceramic resonator mode, f
13.2. Wake up from Stop Mode
Warm-up time interval:
(1) In Internal RC oscillator mode, f
(2) In Crystal oscillator or Ceramic resonator mode, f
14. Reset Function
The SH66K33A has the power-on reset circuit, though it does not have RESET pin. System reset is performed automatically at
power-on, and software starts program from address $000.
obtained at power-on 1ms or less.
15. Code Option
Oscillator Type
0: 4MHz built-in RC oscillator (Default)
1: External Ceramic resonator/Crystal Oscillator: 400kHz - 4MHz
Port Interrupt Source Select
0: PORTB, PORTC interrupt (Default)
1: PORTB, PORTC, PORTD interrupt
Instruction Cycle Time:
0: Instruction cycle time = 4/f
1: Instruction cycle time = 16/f
In order to make the built-in power-on reset circuit operate efficiently, set the voltage rising time until V
interval is 2 ms.
interval is 2 ms.
OSC
OSC
(Default)
OSC
OSC
= 4MHz, the warm-up counter prescaler divide ratio is /2
= 4MHz, the warm-up counter prescaler divide ratio is /2
Power-on
OSC
OSC
= 400kHz - 4MHz, the warm-up counter prescaler divide ratio is /2
= 400kHz - 4MHz, the warm-up counter prescaler divide ratio is /2
Reset state
V
14
DD
circuit output voltage
Internal reset
Power-on reset
Reset released
signal
13
13
(8192) and the warm-up time
(8192) and the warm-up time
DD
SH66K33A
= 0V to 2.2V is
13
13
(8192).
(8192).