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R5F21143DSP View Datasheet(PDF) - Renesas Electronics

Part NameR5F21143DSP Renesas
Renesas Electronics Renesas
DescriptionR8C/14 Group, R8C/15 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
R5F21143DSP Datasheet PDF : 277 Pages
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R8C/14 Group, R8C/15 Group
5. Reset
5.2 Power-On Reset Function
When the RESET pin is connected to the VCC pin via about 5kpull-up resistor and the VCC pin rises,
the function is enabled and the microcomputer resets its pins, CPU, and SFR. When a capacitor is
connected to the RESET pin, always keep the voltage to the RESET pin 0.8VCC or more.
When the input voltage to the VCC pin reaches to the Vdet1 level or above, count operation of the low-
speed on-chip oscillator clock starts. When the operation counts the low-speed on-chip oscillator clock
for 32 times, the internal reset signal is held “H” and the microcomputer enters the reset sequence (See
Figure 5.3). The low-speed on-chip oscillator clock divide-by-8 is automatically selected for the CPU
after reset.
Refer to 4. Special Function Register (SFR) for the status of the SFR after power-on reset.
The voltage monitor 1 reset is enabled after power-on reset.
Figure 5.6 shows the Example of Power-On Reset Circuit and Operation.
0.1V to 2.7V
0.8VCC or above
within td(P-R)
Sampling Time(1, 2) tw(por2) tw(Vpor2–Vdet1)
Internal Reset
(“L” Valid)
1 × 32
1 × 32
1. Hold the voltage of the microcomputer operation voltage range (Vccmin or above) within sampling time.
2. A sampling clock can be selected. Refer to 6. Voltage Detection Circuit for details.
3. Vdet1 indicates the voltage detection level of the voltage detection 1 circuit. Refer to 6. Voltage Detection Circuit for details.
4. Refer to 19. Electrical Characteristics.
Figure 5.6 Example of Power-On Reset Circuit and Operation
Rev.2.10 Jan 19, 2006 Page 23 of 253
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This MCU is built using the high-performance silicon gate CMOS process using a R8C/Tiny Series CPU core and is packaged in a 20-pin plastic molded LSSOP. This MCU operates using sophisticated instructions featuring a high level of instruction efficiency. With 1 Mbyte of address space, it is capable of executing instructions at high speed. Furthermore, the data flash ROM (1KB × 2blocks) is embedded in the R8C/15 group.
The difference between R8C/14 and R8C/15 groups is only the existence of the data flash ROM. Their peripheral functions are the same.

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