R5F21134DFP#U0 Renesas Electronics America, R5F21134DFP#U0 Datasheet - Page 29

• Manufacturer Part Number: R5F21134DFP#U0
• Description: IC R8C MCU FLASH 32LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/13r

Specifications of R5F21134DFP#U0

• Core Size: 16-Bit
• Program Memory Size: 16KB (16K x 8)
• Oscillator Type: Internal
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 22
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• No. Of I/o's: 22
• Eeprom Memory Size: 4KB
• Ram Memory Size: 1024Byte
• Cpu Speed: 20MHz
• No. Of Timers: 16
• Digital Ic Case: RoHS Compliant
• Controller Family/series: R8C/13
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Figure 5.5 Power-on Reset Circuit
RESET
5.1.3 Power-on Reset Function
Jan 27, 2006
The power-on reset is the function which can reset the microcomputer without the external reset
circuit. The RESET pin should be connected to the V
the power-on reset function, the function turns to active and the microcomputer has its pins, CPU,
and SFR initialized. When a capacitor is connected to the RESET pin, always keep the voltage to the
____________
RESET pin 0.8 V
When the input voltage at the V
chip oscillator clock starts. When the operation counts the low-speed on-chip oscillator clock for 32
times, the internal reset is released. Then the program is executed starting from the address indi-
cated by the reset vector. The initialized pins and registers and the status thereof are the same as in
hardware reset 1 excluding the following bits.
• The D40 bit in the D4INT register turns to “1” automatically (voltage detection interrupt enabled)
• The D46 bit in the D4INT register turns to “1” automatically (hardware reset 2 when going through
Vdet)
Additionally, the hardware reset 2 turns to active after the power-on reset. This is because the VC27
bit in the VCR2 register is set to “1” (voltage detection circuit enabled) after the power-on reset same
as the hardware reset 1, so that hardware reset 2 active conditions are all satisfied including above
D40 and D46 bit conditions.
Figure 5.5 shows the power-on reset circuit. Figure 5.6 shows the power-on reset operation.
V
CC
Vdet detection
f
RING-S
____________
page 18 of 205
CC
or more.
counter
5-bit
Trigger
CC
pin reaches to the Vdet level, count operation of the low-speed on-
S
R
CC
Q
pin via about 5 k
____________
pull-up resistance using
Internal reset signal
5.1 Hardware Reset