HT48RA0-5 Holtek Semiconductor, HT48RA0-5 Datasheet - Page 14

• Manufacturer Part Number: HT48RA0-5
• Description: Remote Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

Carrier Output
Note:
Rev.1.00
Carrier output generator
The carrier generator consists of a 9-bit counter and two modulo registers for setting the high-level and low-level peri-
ods - CARH and CARL respectively.
Note: 1. CARH1.1 (CARY) initial value is 1 .
The carrier duty ratio and carrier frequency can be determined by setting the high-level and low-level widths using the
respective modulo registers. Each of these widths can be set in a range of 500ns to 64 s at f
CARH (CARH1.0, CARH0.7~CARH0.0) and CARL (CARL1.0, CARL0.7~CARL0.0) are read and written using in-
structions.
Example:
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
CLR
Register
CARH0
CARH1
CARL0
CARL1
2. CARL1.2 (CARH1.2)~CARL1.7 (CARH1.7) are unused bits, read as 0 .
1. Bit 9 of the modulo register for setting the low-level period (CARL) is fixed to 0 .
2. t9: Flag that enables timer output (timer block, see Timer Configuration)
CARL0 (1AH) Register, CARL1 (1BH), CARH0 (1CH) Register, CARH1 (1DH), Register
A,XXH
CARL0,A
A,XXH
CARL1,A
A,XXH
CARH0,A
A,XXH
CARH1,A
CARH1.1
CH.7
CL.7
Bit7
; XXH = 00H~FFH
; XXH
; XXH = 00H~FFH
; XXH
; The carrier is started by clearing CARY(CARH1.1)= 0
Configuration of Remote Controller Carrier Generator
CH.6
Bit6
CL.
01H, CL.8 (CARL1.0)
02H, CH.8 (CARH1.0)
CH.5
Bit5
CL.
14
CH.4
Bit4
CL.
CH.3
CL.3
Bit3
CH.2
CL.2
Bit2
(CARY)
Fix 0
SYS
CH.1
CH.9
CL.1
Bit1
HT48RA0-5
= 4MHz.
March 23, 2010
www.DataSheet4U.com
CH.0
CH.8
CL.0
CL.8
Bit0