R5F21162SP#U0 Renesas Electronics America, R5F21162SP#U0 Datasheet - Page 38

• Manufacturer Part Number: R5F21162SP#U0
• Description: IC R8C MCU FLASH 8K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/16r

Specifications of R5F21162SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/16 Group, R8C/17 Group
Rev.2.10
REJ09B0169-0210
5.2
Figure 5.6
When the RESET pin is connected to the VCC pin via about 5kΩ pull-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.
NOTES:
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. V
4.
Refer to 19. Electrical Characteristics.
Power-On Reset Function
det1
Jan 19, 2006
indicates the voltage detection level of the voltage detection 1 circuit. Refer to 6. Voltage Detection Circuit for details.
Internal Reset
Example of Power-On Reset Circuit and Operation
(“L” Valid)
About
5kΩ
Signal
V
V
det1
por1
(3)
Page 23 of 254
VCC
RESET
t
w(por1)
t
w(Vpor1–Vdet1)
f
RING-S
1
× 32
Sampling Time
RESET
VCC
0V
0V
(1, 2)
0.1V to 2.7V
t
w(por2)
within td(P-R)
t
w(Vpor2–Vdet1)
V
Vccmin
por2
0.8VCC or above
f
RING-S
1
× 32
V
det1
(3)
5. Reset