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M66014FP Datasheet(PDF) 3 Page - Renesas Technology Corp

Part # M66014FP
Description  16-bit Serial Bus Controller
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M66014FP Datasheet(HTML) 3 Page - Renesas Technology Corp

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M66014FP
REJ03F0265-0200 Rev.2.00 Mar 18, 2008
Page 3 of 4
Serial Data Input/Output Operation
A cycle of 16-bit serial output data setting and serial data communication starts with a write access given by
microcomputer to transmission shift registers in M66014.
M66014 has two 8-bit shift registers, on for upper byte (SRU), the other for lower byte (SRL). If the CS status rises from
"L" to "H" after a write access is given to SRL, serial data communication is started. SRU 8-bit data and SRL 8-bit data
are output in series in this order. Output of each data starts from its most significant bit.
At the
CS rise edge, busy flag in M66014 is set, and OE output shifts from "H" to "L". Shift clock SCLK and serial data
SOUT are then output.
At SCLK fall edges, serial output shift register executes shifting operation, and data on shift register is output in series
from pin SOUT. Serial input data from pin SIN is taken into input shift register at SCLK rise edges.
After the SCLK 16T rise edge, the status of SOUT and
OE shifts to "H" after one bit's delay of SCLK, and busy flag is
reset. When interrupt output is being set to enable, INT output is set.
Remarks
(1) If
CS rises after write operation is executed on SR
L only and not on SRU, SRU data is unstable.
(2) When write operations executed on SRL, M66014 becomes ready for start of serial communication and stands by for
detection of
CS rise. However, if a read access is given after data is written on SR
L while CS is maintained on "L"
level, this standby status is canceled. To resume serial communication in this case, rewrite data on SRL and raise CS.
SRL
write operation
Serial communication period
INT
1T
DO15
(D7U)
(D7L)(D0L)
(D0U)
DO14 DO13 DO12 DO11 DO10 DO9 DO8 DO7 DO6 DO5 DO4 DO3 DO2 DO1
DO0
DI15
DI14
DI13 DI12
DI11
DI10
DI9
DI8
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
2T
8T
9T
16T
SCLK
SOUT
SIN
Busy flag
(in M66014)
CS
OE
Figure 1 Serial Communication Timing Chart


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