參數(shù)資料
型號(hào): 6P8B
廠商: NEC Corp.
英文描述: MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述: 馬鞍山集成電路4位單片機(jī)的紅外遙控傳輸
文件頁數(shù): 29/95頁
文件大小: 692K
代理商: 6P8B
29
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
5.3 Carrier Output
5.3.1 Carrier output generator
The carrier generator consists of a 9-bit counter and two modulo registers for setting the high- and low-level
periods (MOD1 and MOD0 respectively).
Figure 5-3. Configuration of Remote Controller Carrier Generator
Notes 1.
Bit 9 of the modulo register for setting the low-level period (MOD0) is fixed to 0.
2.
t
9
: Flag that enables timer output (timer block) (see
Figure 5-1 Timer Configuration
)
The carrier duty ratio and carrier frequency can be determined by setting the high- and low-level widths using
the respective modulo registers. Each of these widths can be set in a range of 250 ns to 64
μ
s (@ f
X
= 4 MHz).
The system clock multiplied by 2 is used for the 9-bit counter input (8 MHz when f
X
= 4 MHz). MOD0 and MOD1
are read and written using timer manipulation instructions.
MOV A, M00
MOV A, M01
MOV A, M10
MOV A, M11
MOV M00, A
MOV M01, A
MOV M10, A
MOV M11, A
MOV M0, #data10
MOV M1, #data10
MOV M0, @R0
MOV M1, @R0
The values of MOD0 and MOD1 can be calculated from the following expressions.
MOD0 = (2
×
f
X
×
(1 – D)
×
T) – 1
MOD1 = (2
×
f
X
×
D
×
T) – 1
Caution Be sure to input values in range of 001H to 1FFH to MOD0 and MOD1.
Remark
D: Carrier duty ratio (0 < D < 1)
f
X
: Input clock (MHz)
T: Carrier cycle (
μ
s)
Carrier signal
F/F
Match
Clear
M11
t
9
CARY
Modulo register for setting the high-level period (MOD1)
Modulo register for setting the low-level period (MOD0)
Note 1
t
8
t
7
t
6
t
5
t
4
t
3
t
2
t
1
t
0
t
8
0
t
7
t
6
t
5
t
4
t
3
t
2
t
1
0
2f
X
f
X
f
X
t
9
Note 2
M10
M1
M01
Selector
Comparator
9-bit counter
Multiplier
M00
M0
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