R5F21122FP#U0 Renesas Electronics America, R5F21122FP#U0 Datasheet - Page 73

• Manufacturer Part Number: R5F21122FP#U0
• Description: IC R8C MCU FLASH 8K 32LQFP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/12r

Specifications of R5F21122FP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 16MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521134EPB00 - KIT EMULATOR PROBE FOR PC7501R0E521134CPE00 - EMULATOR COMPACT R8C/13
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/12 Group
Rev.1.20
REJ09B0110-0120
Table 12.5 Pulse Width Measurement Mode Specifications
Figure 12.7 TXMR Register in Pulse Width Measurement Mode
Count source
Count operation
Count start condition
Count stop condition
Interrupt request
generation timing
INT1/CNTR0 pin function
CNTR
Read from timer
Write to timer
Select function
12.1.4 Pulse Width Measurement Mode
T i m e r X m o d e r e g i s t e r
In this mode, the timer measures the pulse width of an external signal fed to INT1/CNTR0 pin (See
“Table 12.5 Pulse Width Measurement Mode Specifications”). Figure 12.7 shows the TXMR register
in pulse width measurement mode. Figure 12.8 shows an operation example in pulse width measure-
ment mode.
b 7 b 6 b 5 b 4 b 3 b 2 b1 b 0
0 0
Jan 27, 2006
0
pin function
N O T E S :
Item
1 . T h e I R b i t i n t h e I N T 1 I C r e g i s t e r m a y b e s e t t o “ 1 ” ( i n t e r r u p t r e q u e s t e d ) w h e n t h e R 0 E D G b i t i s r e w r i t t e n .
0
R e f e r t o t h e p a r a g r a p h 1 9 . 2 . 5 “ C h a n g i n g I n t e r r u p t F a c t o r ” i n t h e U s a g e N o t e s R e f e r e n c e B o o k .
0
page 61 of 181
1
1
f
• Down-count
• Continuously counts the selected signal only when the measurement pulse is "H" level,
• When the timer underflows, it reloads the reload register contents before continuing
Write “1” (count start) to TXS bit in TXMR register
Write “0” (count stop) to TXS bit in TXMR register
• When Timer X underflows [Timer X interruption]
• Rising or falling of CNTR0 input (end of measurement period) [INT1 interrupt]
Measurement pulse input
Programmable I/O port
Count value can be read by reading TX register
Same applies to PREX register.
Value written to TX register is written to both reload register and counter.
Same applies to PREX register.
• INT1/CNTR
“H” or “L” level duration can be selected with R0EDG bit as the input pulse measurement
1
or conversely only "L" level.
counting
B i t s y m b o l
, f
T X M O D 2
TXMOD0
TXMOD1
TXS
TXOCNT
R0EDG
T X U N D
TXEDG
2
, f
S y m b o l
T X M R
8
, f
32
0
I N T 1 / C N T R
s w i t c h i n g b i t
O p e r a t i o n m o d e
s e l e c t b i t 0 , 1
T i m e r X c o u n t
s t a r t f l a g
S e t t o " 0 " i n p u l s e w i d t h m e a s u r e m e n t m o d e
S e t t o " 0 " i n p u l s e w i d t h m e a s u r e m e n t m o d e
S e t t o " 0 " i n p u l s e w i d t h m e a s u r e m e n t m o d e
S e t t o " 0 " i n p u l s e w i d t h m e a s u r e m e n t m o d e
polarity switching function
B i t n a m e
0
(1 )
A d d r e s s
p o l a r i t y
0 0 8 B
1 6
b 1 b 0
[ C N T R 0 ]
0 : M e a s u r e s “ H ” l e v e l w i d t h
1 : M e a s u r e s “ L ” l e v e l w i d t h
[ I N T 1 ]
0 : R i s i n g e d g e
1 : F a l l i n g e d g e
0 : Stops counting
1 : Starts counting
1 1 : Pulse width measurement mode
Specification
A f t e r r e s e t
0 0
1 6
Function
_____
12.1 Timer (Timer X)
RW
R W
R W
R W
R W
R W
R W
R W
RW