R5F211B1SP#U0 Renesas Electronics America, R5F211B1SP#U0 Datasheet - Page 139

• 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
Figure 14.10
Conditions: The period from one rising edge to the next rising edge of the measured pulse is measured (R0EDG = 0)
NOTES :
1. The contents of the read-out buffer can be read by reading the TX register in pulse period measurement mode.
2. After an active edge of the measured pulse is input, the TXEDG bit in the TXMR register is set to 1 (active edge found)
3. The TX register should be read before the next active edge is input after the TXEDG bit is set to 1 (active edge found).
4. To set to 0 by a program, use a MOV instruction to write 0 to the TXEDG in the TXMR register. At the same time,
5. To set to 0 by a program, use a MOV instruction to write 0 to the TXUND in the TXMR register. At the same time,
6. Bits TXUND and TXEDG are both set to 1 if timer X underflows and reloads on an active edge simultaneously.
TXS bit in TXMR
register
IR bit in INT1IC
register
CNTR0i pin input
Contents of timer X
Contents of
read-out buffer1
TXEDG bit in
TXMR register
TXUND bit in
TXMR register
IR bit in
TXIC register
Underflow signal of
prescaler X
when the prescale X underflows for the second time.
The contents in the read-out buffer are retained until the TX register is read. If the TX register is not read before the next
active edge is input, the measured result of the previous period is retained.
write 1 to the TXUND bit.
write 1 to the TXEDG bit.
Dec 08, 2006
i = 0 to 1
with the default value of the TX register as 0Fh.
Operating Example in Pulse Period Measurement Mode
1
0
1
0
1
0
1
0
1
0
1
0
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Starts
counting
Set to 1 by program
0Fh
0Fh
0Eh
0Eh
0Dh 0Fh 0Eh 0Dh 0Ch 0Bh 0Ah 09h 0Fh 0Eh 0Dh
Retained
Set to 0 when interrupt request is acknowledged, or set by program
(2)
Timer X
reloads
0Dh
Set to 0 when interrupt request is acknowledged, or set by program
Set to 0 by program
0Bh
Timer X read
(4)
0Ah
Retained
(3)
(2)
09h
Timer X
reloads
0Dh
Timer X read
Set to 0 by program
(3)
01h 00h 0Fh 0Eh
01h
(5)
00h
(6)
0Fh 0Eh
Timer X
reloads
14. Timers