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M66014FP Datasheet(PDF) 2 Page - Mitsubishi Electric Semiconductor

Part No. M66014FP
Description  16-BIT SERIAL BUS CONTROLLER
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M66014FP Datasheet(HTML) 2 Page - Mitsubishi Electric Semiconductor

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MITSUBISHI
〈DIGITAL ASSP〉
M66014FP
16-BIT SERIAL BUS CONTROLLER
3. 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 micro-
computer 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 se-
ries 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 SRL only
and not on SRU, SRU data is unstable.
(2) When write operations executed on SRL, M66014 be-
comes 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 SRL while CS is maintained
on “L” level, this standby status is canceled. To resume se-
rial communication in this case, rewrite data on SRL and
raise CS.
CS
Serial communication period
SRL
write operation
OE
INT
SCLK
SOUT
SIN
Busy flag
(in M66014)
Serial Communication Timing Chart
D015 D014 D013 D012 D011 D010 D09
D08
D07
D06
D05
D04
D03
D02
D01
D00
(D7U)
(D0U) (D7L)
(D0L)
DI8
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
1T
2T
8T
9T
16T
DI15 DI14 DI13 DI12 DI11 DI10
DI9


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