Block Diagram Of Remote Controller Receiver - NEC PD789488 User Manual

CHAPTER 15 REMOTE CONTROLLER RECEIVER (
RIN/P34
RMEN
RMIN
6
f /2
X
7
f /2
X
8
f /2
X
f
XT
NCW
RMEN PRSEN
(1) Remote controller receive shift register (RMSR)
This is an 8-bit register for reception of remote controller data.
Data is stored in bit 7 first. Each time new data is stored, the stored data is shifted to the lower bits. Therefore,
the latest data is stored in bit 7, and the first data is stored in bit 0.
RMSR is read with an 8-bit memory manipulation instruction.
RESET input sets RMSR to 00H.
Also, RMSR is cleared to 00H under any of the following conditions.
• Remote controller stops operation (RMEN = 0).
• Error is detected (INTRERR is generated).
• INTDFULL is generated.
• RMSR is read after INTREND has been generated.
Caution Reading RMSR is disabled during remote controller reception. Complete reception, then
read RMSR. When the reading operation is complete, RMSR is cleared. Therefore, values
once read are not guaranteed.
272
Figure 15-1. Block Diagram of Remote Controller Receiver
Noise
Edge
canceler
detection
NCW
Clock
counter
Compare register
RMGPHS RMGPHL
RMDLL
RMDLS
RMDH0L
RMDH0S
RMDH1S RMDH1L
End-width select register (RMER)
RMIN RMCK1 RMCK0
Remote controller receive control register (
Internal bus
User's Manual U15331EJ4V1UD
µ
PD789489, 78F9489 ONLY)
Remote controller receive
data register (RMDR)
Remote controller receive
controller shift
register receive
counter register
Selection control
signal
RMCN)
INTRIN
shift register (RMSR)
Remote
INTDFULL
(RMSCR)
INTGP
INTRERR
INTREND