R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 450

• Manufacturer Part Number: R5F21346CNFP#U0
• Description: MCU 1KB FLASH 32K ROM 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/34Cr

Specifications of R5F21346CNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 43
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/34C Group
REJ09B0586-0100 Rev.1.00 Jan 13, 2010
Page 417 of 723
21.2
Figure 21.1
In real-time clock mode, a 1-second signal is generated from fC4 using a divide-by-2 frequency divider, 4-bit
counter, and 8-bit counter and used to count seconds, minutes, hours, and days of the week. Figure 21.1 shows a
Block Diagram of Real-Time Clock Mode and Table 21.2 lists the Real-Time Clock Mode Specifications. Table
21.3 lists the Interrupt Sources, Figure 21.2 shows the Definition of Time Representation and Figure 21.3 shows
the Operating Example in Real-Time Clock Mode.
(8.192kHz)
Real-Time Clock Mode
fC4
TOENA, H12_H24, PM, INT: Bits in TRECR1 register
SEIE, MNIE, HRIE, DYIE, WKIE: Bits in TRECR2 register
BSY: Bit in TRESEC, TREMIN, TREHR, TREWK register
RCS4 to RCS6: Bits in TRECSR register
Note
BSY
bit
1: The TREOSEL0 bit in the TIMSR register is used to select which pin is assigned.
TRESEC
register
Block Diagram of Real-Time Clock Mode
1/2
MNIE
SEIE
Overflow
TREMIN
4-bit counter
register
(1/16)
HRIE
Overflow
H12_H24
bit
Data bus
TREHR
register
8-bit counter
(1/256)
PM
bit
DYIE
Overflow
WKIE
TREWK
register
(1s) Overflow
000
fC
f2
f4
f8
= 010b
RCS6 to RCS4
= 001b
= 100b
Timing
control
= 000b
= 011b
INT
bit
Timer RE
interrupt
TOENA
TREO pin
21. Timer RE
(1)