R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 153

• Manufacturer Part Number: R5F21257SNFP#U0
• Description: IC R8C/25 MCU FLASH 52LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/25r

Specifications of R5F21257SNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 52-LQFP
• For Use With: R0K521256S000BE - KIT EVAL STARTER FOR R8C/25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/24 Group, R8C/25 Group
Rev.3.00
REJ09B0244-0300
14.1
Figure 14.1
INT1/TRAIO (P1_7) pin
INT1/TRAIO (P1_5) pin
Timer RA is an 8-bit timer with an 8-bit prescaler.
The prescaler and timer each consist of a reload register and counter. The reload register and counter are allocated
at the same address, and can be accessed when accessing registers TRAPRE and TRA (refer to Tables 14.2 to 14.6
the Specifications of Each Mode).
The count source for timer RA is the operating clock that regulates the timing of timer operations such as counting
and reloading.
Figure 14.1 shows a Block Diagram of Timer RA. Figures 14.2 and 14.3 show the registers associated with Timer
RA.
Timer RA has the following five operating modes:
• Timer mode:
• Pulse output mode:
• Event counter mode:
• Pulse width measurement mode:
• Pulse period measurement mode:
Timer RA
TCK2 to TCK0 bit
Feb 29, 2008
fOCO
fC32
TRAO pin
f1
f8
f2
= 000b
= 001b
= 010b
= 011b
= 100b
TIOSEL = 0
TIOSEL = 1
Block Diagram of Timer RA
f32
f1
f8
TCKCUT bit
TIPF1 to TIPF0 bits
= 01b
= 10b
= 11b
TOENA bit
TIPF1 to TIPF0 bits
= other than
000b
Page 134 of 485
= 00b
Digital
filter
TMOD2 to TMOD0
TMOD2 to TMOD0
switching
= other than 010b
Polarity
The timer counts the internal count source.
The timer counts the internal count source and outputs pulses of which
polarity inverted by underflow of the timer.
The timer counts external pulses.
The timer measures the pulse width of an external pulse.
The timer measures the pulse period of an external pulse.
= 010b
TMOD2 to TMOD0 = 001b
TOPCR bit
TMOD2 to TMOD0
TCSTF, TSTOP: Bits in TRACR register
TEDGSEL, TOPCR, TOENA, TIOSEL, TIPF1, TIPF0: Bits in TRAIOC register
TMOD2 to TMOD0, TCK2 to TCK0, TCKCUT: Bits in TRAMR register
= 011b or 100b
TCSTF bit
TEDGSEL = 1
TEDGSEL = 0
Count control
TRAPRE register
Reload
register
circle
(prescaler)
Counter
Q
Q
Toggle flip-flop
Data bus
Measurement completion
CLR
register
signal
Reload
TRA register
CK
Counter
(timer)
Write to TRAMR register
Write 1 to TSTOP bit
Underflow signal
Timer RA interrupt
14. Timers