Renesas EMMA Mobile 1, User Manual

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CHAPTER 4 DESCRIPTION OF FUNCTIONS
User’s Manual S19262EJ3V0UM
43
Table 4-2. PULSE_WIDTH[7:0] Setting Examples
f
XIN
= 1.8432 MHz f
XIN
= 3.072 MHz f
XIN
= 14.7456 MHz f
XIN
= 50 MHz Desired Valid
Reception
Pulse Width
(

s)
PULSE_
WIDTH[7:0]
Measured
Valid
Reception
Pulse Width
(

s)
PULSE_
WIDTH[7:0]
Measured
Valid
Reception
Pulse Width
(

s)
PULSE_
WIDTH[7:0]
Measured
Valid
Reception
Pulse Width
(

s)
PULSE_
WIDTH[7:0]
Measured
Valid
Reception
Pulse Width
(

s)
1.0

Note

Note
2 0.98 13 0.95 49 1.0
1.41

Note

Note
3 1.30 19 1.36 69 1.41
2.0 2 1.63 5 1.95 28 1.97 99 2.0
3.0 4 2.71 8 2.93 43 2.98 149 3.0
Note The desired pulse width cannot be detected because the XIN clock frequency is low.
The lower limit of the XIN clock frequency for the desired valid reception pulse width is obtained using the
following expression, by assigning the PULSE_WIDTH[7:0] value (= 2, the minimum setting) to the valid
reception pulse width expression.
f
XIN
(MHz)

1 /(desired valid reception pulse width (

s) / 3)
Remark f
XIN
: Frequency of reference clock (XIN)
4.6.3 Masking of reception data for IR decoder echo cancellation
The IR decoder can mask reception data (stop pulse detection) during transmission for echo cancellation. The
mask period can be extended for the transmission period plus the period specified by the IRCR2 to IRCR4 registers
(MASK_PERIOD[19:0]). Whether to enable masking of the reception data can be specified by using bit 6
(IR_MASK_OFF) of the IRCR0 register.
Table 4-3. MASK_PERIOD[19:0] Setting Examples
f
XIN
= 1.8432 MHz f
XIN
= 3.072 MHz f
XIN
= 14.7456 MHz f
XIN
= 50 MHz Desired
Mask
Extension
Period (

s)
MASK_
PERIOD
[19:0]
Measured
Mask
Extension
Period (

s)
MASK_
PERIOD
[19:0]
Measured
Mask
Extension
Period (

s)
MASK_
PERIOD
[19:0]
Measured
Mask
Extension
Period (

s)
MASK_
PERIOD
[19:0]
Measured
Mask
Extension
Period (

s)
50 91 50.46 152 50.13 736 50.05 2,498 50
100 183 100.37 306 100.26 1,473 100.03 4,998 100
1,000 1,842 1000.43 3,070 1,000 14,744 1,000.03 49,998 1,000
5,000 9,214 5,000 15,358 5,000 73,726 5,000 249,998 5,000
10,000 18,430 10,000 30,718 10,000 147,454 10,000 499,998 10,000