R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 318

• Manufacturer Part Number: R5F211B1SP#U0
• Description: IC R8C MCU FLASH 4K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/1Br

Specifications of R5F211B1SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SIO, SSU, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 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: R0K5211B4S001BE - KIT STARTER FOR R8C/18191A1BR0K5211B4S000BE - KIT DEV EVALUATION R8C/1BR0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/1A Group, R8C/1B Group
Rev.1.30
REJ09B0252-0130
20.3
20.3.1
20.3.2
Precautions on Timers
• Timer X stops counting after a reset. Set the values in the timer and prescaler before the count starts.
• Even if the prescaler and timer are read out in 16-bit units, these registers are read 1 byte at a time by the
• Do not rewrite bits TXMOD0 to TXMOD1, and bits TXMOD2 and TXS simultaneously.
• In pulse period measurement mode, bits TXEDG and TXUND in the TXMR register can be set to 0 by
• When changing to pulse period measurement mode from another mode, the contents of bits TXEDG and
• The TXEDG bit may be set to 1 by the prescaler X underflow generated after the count starts.
• When using the pulse period measurement mode, leave two or more periods of the prescaler X immediately
• The TXS bit in the TXMR register has a function to instruct timer X to start or stop counting and a function
• Timer Z stops counting after a reset. Set the values in the timer and prescaler before the count starts.
• Even if the prescaler and timer are read out in 16-bit units, these registers are read 1 byte at a time by the
• Do not rewrite bits TZMOD0 to TZMOD1, and the TZS bit simultaneously.
• In programmable one-shot generation mode, and programmable wait one-shot generation mode, when
• The TZS bit in the TZMR register has a function to instruct timer Z to start or stop counting and a function
Dec 08, 2006
MCU. Consequently, the timer value may be updated during the period when these two registers are being
read.
writing 0 to these bits by a program. However, these bits remain unchanged if 1 is written. When using the
READ-MODIFY-WRITE instruction for the TXMR register, the TXEDG or TXUND bit may be set to 0
although these bits are set to 1 while the instruction is being executed. In this case, write 1 to the TXEDG or
TXUND bit which is not supposed to be set to 0 with the MOV instruction.
TXUND are undefined. Write 0 to bits TXEDG and TXUND before the count starts.
after the count starts, then set the TXEDG bit to 0.
to indicate that the count has started or stopped.
0 (count stops) can be read until the following count source is applied after 1 (count starts) is written to the
TXS bit while the count is being stopped. If the following count source is applied, 1 can be read from the
TXS bit. After writing 1 to the TXS bit, do not access registers associated with timer X (registers TXMR,
PREX, TX, TCSS, and TXIC) except for the TXS bit, until 1 can be read from the TXS bit. The count starts
at the following count source after the TXS bit is set to 1.
Also, after writing 0 (count stops) to the TXS bit during the count, timer X stops counting at the following
count source.
1 (count starts) can be read by reading the TXS bit until the count stops after writing 0 to the TXS bit. After
writing 0 to the TXS bit, do not access registers associated with timer X except for the TXS bit, until 0 can
be read from the TXS bit.
MCU. Consequently, the timer value may be updated during the period when these two registers are being
read.
setting the TZS bit in the TZMR register to 0 (stops counting) or setting the TZOS bit in the TZOC register
to 0 (stops one-shot), the timer reloads the value of the reload register and stops. Therefore, in
programmable one-shot generation mode and programmable wait one-shot generation mode read the timer
count value before the timer stops.
to indicate that the count has started or stopped.
0 (count stops) can be read until the following count source is applied after 1 (count starts) is written to the
TZS bit while the count is being stopped. If the following count source is applied, 1 can be read from the
TZS bit. After writing 1 to the TZS bit, do not access registers associated with timer Z (registers TZMR,
PREZ, TZSC, TZPR, TZOC, PUM, TCSC, and TZIC) except for the TZS bit, until 1 can be read from the
TZS bit. The count starts at the following count source after the TZS bit is set to 1.
Also, after writing 0 (count stops) to the TZS bit during the count, timer Z stops counting at the following
count source.
1 (count starts) can be read by reading the TZS bit until the count stops after writing 0 to the TZS bit. After
writing 0 to the TZS bit, do not access registers associated with timer Z except for the TZS bit, until 0 can
be read from the TZS bit.
Notes on Timer X
Notes on Timer Z
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20. Usage Notes