GMS81C5108 Datasheet, PDF (79/102 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS81C5108
20. REMOCON CARRIER GENERATOR
The GMS81C5108 has a circuit to generate carriers for the
remote controller. This circuit consists of Remocon Mode
Register (RMR), Carrier Frequency High Selection (CF-
HS), Carrier Frequency Low Selection (CFLS), Remocon
Data High Register (RDHR), Remocon Data Low Register
(RDLR), Remocon Data Counter (RDC), Remocon Output
20.1 Remocon Signal Output Control
The output of the REMOUT pin which outputs carriers is
controlled by RODR and ROB register. While the Bit-0 of
RODR is “1”, the REMOUT pin outputs a carrier signal
generated by the remote controller carrier generator. While
this Bit is “0”, the output of the REMOUT pin is low.
The content of the ROB is automatically transferred to the
Data Register (RODR) and Remocon Output Buffer
(ROB) as shown in Figure 20-1. A carrier duty and fre-
quency are determined by the contents of these registers. A
source clock input to the 6-bit counter is selected by diving
the frequency of the system clock by two (main or sub
clock).
RODR by an interrupt signal generated by the 8-Bit timer.
The content of the RODR.0 is output to the REMOUT pin.
Namely, the REMOUT pin outputs a high-level signal
when RODR.0 is “1” and a low-level signal when RODR.0
is “0”.
fxin is f_MAIN or f_SUB.
SCMR[1:0]
2
X_IN
0X
SX_IN
1X
Pre-
scaler
fxin ÷ 8
fxin ÷ 16
fxin ÷ 32
fxin ÷ 64
fxin ÷ 128
fxin ÷ 256
fxin ÷ 512
REN ≠ 0
RDCK[2:0]
2
MUX
RDHR (8-Bit)
RDLR (8-Bit)
Comparator
RDC(8Bit)
REMF
RDPE
REN
Remocon
Interrupt
fxin ÷ 1
fxin ÷ 2
fxin ÷ 4
fxin ÷ 8
MUX
6-Bit Counter
Comparator
ROB (1Bit)
RODR (1Bit)
REN ≠ 0
& CCK[1:0]
CFHS (6-Bit)
CFLS (6-Bit)
REMOUT
RMR (Remocon Mode Register)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit :
7
6
5
4
3
2
1
0
-
REN
CCK1 CCK0
REN (Remocon Operation Enable)
0 : Disable
1 : Enable
RDPE RDCK2 RDCK1 RDCK0
RDPE (Remocon Data Pulse Enable)
0 : Disable
1 : Enable
ADDRESS : 0F6_H
RESET VALUE : -0000000_B
RDCK[2:0] (Remocon Data Clock Selection)
000: f_MAIN÷2³ or f_SUB÷2³
001: f_MAIN÷2⁴ or f_SUB÷2⁴
010: f_MAIN÷2⁵ or f_SUB÷2⁵
011: f_MAIN÷2⁶ or f_SUB÷2⁶
100: f_MAIN÷2⁷ or fSUB÷2⁷
101: f_MAIN÷2⁸ or f_SUB÷2⁸
110: f_MAIN÷2⁹ or fSUB÷2⁹
111: Carrier Signal
CCK[1:0] (Carrier Clock Source Selection)
00: f_MAIN
01: f_MAIN÷2
10: f_MAIN÷2²
11: f_MAIN÷2³
or f_SUB
or f_SUB÷2
or f_SUB÷2²
or f_SUB÷2³
f_MAIN: main-clock frequency
f_SUB: sub-clock frequency
Figure 20-1 Remocon Carrier Generator Block Diagram
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JUNE 2001 Ver 1.0