Abov MC96FR364B, User Manual

Page: 111 / 194

November, 2018 Rev.1.4 111
11.7 Carrier Generator
11.7.1 Overview
MC96FR364B has a specific module to generate carrier signal for remote control application. The
internal carrier(CRF) signal is AND-ed with register value(RODR) and outputs through REMOUT port.
The frequency and duty ratio of carrier signal is controlled by two 8-bit registers, CFRH and CFRL.
Carrier signal can be on/off at previous stage of REMOUT port by the CEN bit in RMR register. When
CEN=1, the remote out signal is generated by AND-ing carrier signal with RODR value. When CEN=0,
the 8-bit counter for carrier generation(=CRC) stops and the remote out signal comes directly from
RODR value. The RODR register is updated by ROB register when the 16-bit counter for data pulse
generation(=RDC) reaches to RDRH or RDRL
NOTE
. In this case, the RDPE bit in RMR should be ‘1’. At
each match event, an interrupt can be issued. The RODR register can also be altered by writing to
this register. In this case, the RDPE bit is to be cleared to ‘0’. The base clock for RDC and CRC is
system clock, SCLK or its divided clock. Note that the output clock of main oscillator, XINCLK, may
differ from SCLK.
NOTE The concatenated RDRH and RDRL composes RDR value. And the RDR register is loaded with RDB(=
concatenated RDBH and RDBL) when interrupt is generated. This is like the relationship between ROB and
RODR.
11.7.2 Block Diagram
Pre
scaler
M
U
X
÷ 1
÷2
÷3
÷ 4
2
RDIF
RDCK[2:0]
RDC (16-bit)
SCLK
CRC (8-bit)
Remocon
Interrupt
÷8
÷16
÷ 64
M
U
X
÷1
÷2
÷3
÷4
RDR (16-bit)
RDPE
CEN
3
CCK[1:0]
CFRH (8-bit)
CFRL (8-bit)
RODR
ROB
CEN
CRF
RDR=RDRH(8-bt):RDRL(8-bit)
RDB=RDBH(8-bt):RDBL(8-bit)
RDB (16-bit)
16
1
CME
Figure 11-29 Block Diagram of Carrier Generator
REMOUT
CGOUT