R5F21122FP#U0 Renesas Electronics America, R5F21122FP#U0 Datasheet - Page 75

• 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 12.6 Pulse Period Measurement Mode Specifications
Figure 12.9 TXMR Register in Pulse Period Measurement Mode
NOTES:
Count source
Count operation
Count start condition
Count stop condition
Interrupt request
generation timing
INT1/CNTR
CNTR
Read from timer
Write to timer
Select function
1. The period of input pulse must be longer than twice the period of prescaler X. Longer pulse for H width and L width than
12.1.5 Pulse Period Measurement Mode
the prescaler X period must be input. If shorter pulse than the period is input to the CNTR0 pin, the input may be disabled.
In this mode, the timer measures the pulse period of an external signal fed to INT1/CNTR
“Table 12.6 Pulse Period Measurement Mode Specifications”). Figure 12.9 shows the TXMR register
in pulse period measurement mode. Figure 12.10 shows an operation example in pulse period mea-
surement mode.
Jan 27, 2006
0
pin function
T i m e r X m o d e r e g i s t e r
b 7 b 6 b 5 b 4 b 3 b 2 b1 b 0
N O T E S :
2 . T h i s b i t i s s e t t o
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 .
pin function
1
0
page 63 of 181
0 0
“ 0 ”
b y w r i t i n g
Contents in the read-out buffer can be read by reading TX register. The value retained in
f
• Down-count
• After an active edge of measurement pulse is input, contents in the read-out buffer is
Write “1” (count start) to TXS bit in TXMR register
Write “0” (count stop) to TXS bit in TXMR register
• When Timer X underflows or reloads [Timer X interrupt]
• Rising or falling of CNTR0 input (end of measurement period) [INT1 interrupt]
Measurement pulse input
Programmable I/O port
the read-out buffer is released by reading TX register.
Value written to TX register is written to both reload register and counter.
Same applies to PREX register.
• INT1/CNTR
1
retained in the first underflow of prescaler X. Then the timer X reloads contents in the
reload register in the second underflow of prescaler X and continues counting.
Measurement period of input pulse can be selected with R0EDG bit.
, f
B i t s y m b o l
T X U N D
T X O C N T
T X M O D 2
T X E D G
T X M O D 0
T X M O D 1
2
TXS
R0EDG
, f
S y m b o l
T X M R
8
, f
“ 0 ”
(2 )
(2 )
32
i n a p r o g r a m . ( I t r e m a i n s u n c h a n g e d e v e n i f w r i t i n g
0
Active edge
judgment flag
O p e r a t i o n m o d e
s e l e c t b i t 2
T i m e r X
u n d e r f l o w f l a g
T i m e r X c o u n t
s t a r t f l a g
Set to “0” in pulse period measurement mode
Operation mode
select bit 0, 1
INT1/CNTR0
polarity
switching bit
polarity switching function
Bit name
(1)
A d d r e s s
0 0 8 B
(1)
(INT1 interrupt input)
1 6
_______
b1 b0
0 : No active edge
1 : Active edge found
[ C N T R 0 ]
0 : M e a s u r e s a m e a s u r e m e n t p u l s e f r o m o n e
1 : M e a s u r e s a m e a s u r e m e n t p u l s e f r o m o n e
[ 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 : S t o p s c o u n t i n g
1 : S t a r t s c o u n t i n g
1 : P u l s e p e r i o d m e a s u r e m e n t m o d e
0 : N o u n d e r f l o w
1 : U n d e r f l o w f o u n d
0 0 : Timer mode or pulse period
r i s i n g e d g e t o t h e n e x t r i s i n g e d g e
f a l l i n g e d g e t o t h e n e x t f a l l i n g e d g e
Specification
measurement mode
A f t e r r e s e t
0 0
1 6
F u n c t i o n
“ 1 ”
)
12.1 Timer (Timer X)
RW
R W
R W
R W
R W
R W
R W
R W
R W
0
pin (See