R5F21133DFP RENESAS [Renesas Technology Corp], R5F21133DFP Datasheet - Page 85

• Manufacturer Part Number: R5F21133DFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY/R8C/Tiny SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

R8C/13 Group
Rev.1.20
REJ09B0111-0120
Table 12.3 Pulse Output Mode Specifications
NOTES:
Figure 12.5 TXMR Register in Pulse Output Mode
1. The level of the output pulse becomes the level when the pulse output starts when the TX register is written to.
Count source
Count operation
Divide ratio
Count start condition
Count stop condition
Interrupt request
generation timing
INT1/CNTR
CNTR
Read from timer
Write to timer
Select function
Timer X mode register
b 7 b 6 b5 b 4 b 3 b 2 b 1 b 0
0
12.1.2 Pulse Output Mode
N O T E S :
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 .
In this mode, the timer counts an internally generated count source, and outputs from the CNTR0 pin
a pulse whose polarity is inverted each time the timer underflows (See “Table 12.3 Pulse Output mode
Specifications”). Figure 12.5 shows TXMR register in pulse output mode.
0
Jan 27, 2006
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
0
Item
0
pin function
0 1
page 74 of 205
B i t s y m b o l
f
• Down-count
• When the timer underflows, the contents in the reload register is reloaded and the count
1/(n+1)(m+1)
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]
Pulse output
Programmable I/O port or inverted output of CNTR
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
• Inverted pulse output function
1
T X M O D 0
T X M O D 1
TXOCNT
T X M O D 2
TXEDG
TXUND
Polarity level at starting of pulse output can be selected with R0EDG bit
(selected by TXOCNT bit)
is contiuned.
Inverted pulse of CNTR0 output polarity can be output from the CNTR0 pin
R0EDG
, f
_____
TXS
2
S y m b o l
T X M R
, f
8
, f
32
INT1/CNTR
switching bit
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
P 3
s e l e c t b i t
0
S e t t o " 0 " i n p u l s e o u t p u t m o d e
S e t t o " 0 " i n p u l s e o u t p u t m o d e
S e t t o " 0 " i n p u l s e o u t p u t m o d e
polarity switching function
0
Bit name
/ C N T R
n: set value of PREX register, m: set value of TX register
0
0
(1)
A d d r e s s
polarity
0 0 8 B
1 6
b1 b0
0 1 : P u l s e o u t p u t m o d e
0: CNTR
1: CNTR
0 : Stops counting
1 : Starts counting
0 : Port P3
1 : CNTR
Specification
A f t e r r e s e t
0
0
0
output starts at "H"
output starts at "L"
0
output
0 0
1 6
Function
0
___________
12.1 Timer (Timer X)
(1)
R W
R W
R W
R W
R W
R W
R W
R W
RW