R5F21257SNFP#U0 Renesas Electronics America, R5F21257SNFP#U0 Datasheet - Page 169

• 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
14.2
Figure 14.12
Timer RA underflow
TRBO pin
Timer RB is an 8-bit timer with an 8-bit prescaler.
The prescaler and timer each consist of a reload register and counter (refer to Tables 14.7 to 14.10 the
Specifications of Each Mode).
Timer RB has timer RB primary and timer RB secondary as reload registers.
The count source for timer RB is the operating clock that regulates the timing of timer operations such as counting
and reloading.
Figure 14.12 shows a Block Diagram of Timer RB. Figures 14.13 to 14.15 show the registers associated with timer
RB.
Timer RB has four operation modes listed as follows:
INT0 pin
TSTART, TCSTF: Bit in TRBCR register
TOSSTF: Bit in TRBOCR register
TOPL, TOCNT, INOSTG, INOSEG: Bits in TRBIOC register
TMOD1 to TMOD0, TCK1 to TCK0, TCKCUT: Bits in TRBMR register
TCK1 to TCK0 bits
• Timer mode:
• Programmable waveform generation mode:
• Programmable one-shot generation mode:
• Programmable wait one-shot generation mode:
Timer RB
Feb 29, 2008
f1
f2
TMOD1 to TMOD0 bits
= 01b
f8
= 00b
= 01b
= 10b
= 11b
Block Diagram of Timer RB
,
10b, 11b
TCKCUT bit
Page 150 of 485
TOCNT = 1
TOCNT = 0
Digital filter
P3_1 bit in P3 register
edge or both edges
TRBPRE register
selected to be one
register
Reload
Input polarity
INT0EN bit
INT0PL bit
TSTART bit
(prescaler)
Counter
The timer counts an internal count source (peripheral
function clock or timer RA underflows).
The timer outputs pulses of a given width successively.
The timer outputs a one-shot pulse.
The timer outputs a delayed one-shot pulse.
TMOD1 to TMOD0 bits
= 10b or 11b
Data bus
TOPL = 1
TOPL = 0
register
Reload
INOSEG bit
TRBSC
register
Polarity
Counter (timer RB)
select
(Timer)
Q
Q
Toggle flip-flop
TOSSTF bit
register
Reload
CLR
INOSTG bit
TRBPR
register
CK
TCSTF bit
TMOD1 to TMOD0 bits
= 01b
Timer RB interrupt
INT0 interrupt
,
10b, 11b
14. Timers