II CORE BLOCK: INITIAL RESET
B-II-3-2
EPSON
S1C33L03 FUNCTION PART
Power-on Reset
Be sure to reset (cold start) the chip after turning on the power to start operating.
Since the #RESET pin is directly connected to an input gate, a power-on reset circuit should be configured outside
the chip.
An initial reset (#RESET = low) turns the high-speed (OSC3) oscillation circuit on. The CPU starts operating with
the OSC3 clock at the rising edge of the reset signal. The high-speed (OSC3) oscillation circuit takes time (10 ms
max. under the standard condition in 3.3 V) for the oscillation to stabilize, therefore initial reset must be released
after an appropriate oscillation-stabilization time has passed in order to start up the CPU without fault. The initial
reset pulse width must be exceeded the oscillation-stabilization time.
Figure 3.2 shows a power-on reset timing chart.
V
DD
#RESET
t
STA3
(OSC3 oscillation start time) or more
3.0 V (V
DD
= 3.3 V)
0.5V
DD
0.1V
DD
Power on
Figure 3.2 Power-on Reset Timing
Maintain the #RESET pin at 0.1•V
DD
or less (low level) after turning the power on until the supply voltage rises at
least to the oscillation start voltage (3.0 V). Furthermore, maintain the #RESET pin at 0.5•V
DD
or less until the
high-speed (OSC3) oscillation circuit stabilizes oscillating.
Note: The OSC3 oscillation start time varies due to the elements used, board pattern and operating
environment, therefore allow enough margin for the reset-release time. Refer to "Oscillation
Characteristics", in which an example of oscillation start time is provided.
Reset Pulse
A low pulse can be input to the #RESET pin for resetting the chip being operated.
The minimum reset pulse width is provided in "AC Characteristics". Be sure to input a pulse that has a pulse width
longer than the minimum value.
To reset the chip when the high-speed (OSC3) oscillation circuit is in off status, the pulse width must be extended
until the oscillation stabilizes similarly to the power-on reset. Be aware that a short reset pulse may cause an
operation error.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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Page 15: ...S1C33L03 PRODUCT PART ...
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Page 147: ...S1C33L03 FUNCTION PART ...
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Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
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Page 152: ...I OUTLINE INTRODUCTION B I 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 162: ...I OUTLINE LIST OF PINS B I 3 8 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
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Page 166: ...II CORE BLOCK INTRODUCTION B II 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 172: ...II CORE BLOCK CPU AND OPERATING MODE B II 2 6 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 224: ...II CORE BLOCK BCU Bus Control Unit B II 4 48 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 262: ...II CORE BLOCK DBG Debug Unit B II 7 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
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Page 266: ...III PERIPHERAL BLOCK INTRODUCTION B III 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 322: ...III PERIPHERAL BLOCK WATCHDOG TIMER B III 5 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
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Page 418: ...IV ANALOG BLOCK INTRODUCTION B IV 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 434: ...IV ANALOG BLOCK A D CONVERTER B IV 2 16 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
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Page 438: ...V DMA BLOCK INTRODUCTION B V 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 492: ...V DMA BLOCK IDMA Intelligent DMA B V 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
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Page 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
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Page 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
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