UPD6P9 datasheet(21/45 Pages) RENESAS

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µPD6P9

Data Sheet U15144EJ1V1DS

4.3 Carrier Output

4.3.1 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 4-3. 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. t9: Flag that enables timer output (timer block) (see Figure 4-1 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

µs (@ fX = 4 MHz).

The system clock multiplied by 2 is used for the 9-bit counter input (8 MHz when fX = 4 MHz). MOD0 and MOD1

are read and written using timer manipulation instructions.

MOV A, M00

MOV M00, A

MOV M0, #data10

MOV A, M01

MOV M01, A

MOV M1, #data10

MOV A, M10

MOV M10, A

MOV M0, @R0

MOV A, M11

MOV M11, A

MOV M1, @R0

The values of MOD0 and MOD1 can be calculated from the following expressions.

MOD0 = (2

× fX × (1 – D) × T) – 1

MOD1 = (2

× fX × 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)

fX: Input clock (MHz)

T: Carrier cycle (

µs)

Carrier signal

F/F

Match

Clear

M11

CARY Modulo register for setting the high-level period (MOD1)

Modulo register for setting the low-level period (MOD0)

Note 1

t7 t6

0t7 t6

2fX

t9Note 2

M10

M01

Selector

Comparator

9-bit counter

Multiplier

M00

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