LC709006A-TLM-E 查看數據表（PDF） - ON Semiconductor
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LC709006A-TLM-E Datasheet PDF : 14 Pages
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LC709006A
Continued from preceding page.
Pin Name
I/O
Description
DIN
I
• Serial data input pin
DOUT
O • Serial data output pin
CLK
• Serial clock input pin
I
• Port data is placed on DOUT on the falling edge of this clock.
• The data from DIN is latched on the negative-to-positive transition of this clock.
CS
I
• Chip select input pin
• Setting this pin to the low level enables serial data to be input or output.
RES
I
• Device's system reset input pin
• Setting this pin to the low level initializes the internal control circuit and registers and
puts DOUT in the high level and all data port pins (P00 to P27) into the Hi-Z state.
I/O Type
Input: TTL
Output: CMOS
Input: TTL
Schmidt
Input: TTL
Schmidt
Input: TTL
Schmidt
Reset Time
High
Port Output Types and I/O States
The output type and I/O states of the LC709006A's ports can be selected by configuring the data direction register
(DDR) and data register (DTR). Port data can be taken into the LC709006A only when DDR is set to 0 (Nch-open
drain) and DTR is set to 1 (Nch-Tr OFF). The ports are held high for the other settings of DDR and DTR.
Port Name
P00 to P07
P10 to P17
P20 to P27
DDR
0
0
1
1
DTR
1
0
1
0
Output Type
Nch-open drain
Nch-open drain
CMOS
CMOS
Port
Input
Enabled
Disabled (High)
Disabled (High)
Disabled (High)
Output
Hi-Z
Low
High
Low
Port Output Circuit
Nch-open drain
CMOS
VDDP0 to 2
Principles of Operation
The LC709006A accomplishes data transmission and reception to and from the MCU through synchronous serial
communication and performs I/O operations on the extended ports in parallel mode. Its communication modes (MCU to
LC709006A by serial to parallel conversion and LC709006A to MCU by parallel to serial conversion) include the
initial communication modes (modes 0 and 1) in which the LC709006A initializes itself and the data communication
mode in which the LC709006A sends and receives port data. The initial communication modes are used for various
communication control purposes for the first time in system operation after a power-on or system reset. In these modes,
the LC709006A sets up the I/O mode and output type of the ports. The data communication mode is used for
communication control after the end of the initial communication modes. In this mode, the LC709006A carries out
actual port I/O operations. The port I/O mode and output type settings are stored in the data direction register (DDR).
The data output state settings ("High" output, "Hi-Z" output, or "Low" output) are stored in the data register (DTR).
The LC709006A's operating modes are summarized below, followed by detailed mode descriptions.
Communication Mode
Initial communication mode
Mode 0
Mode 1
Data communication mode
Description
Sets the output type of all ports to "N-ch-open drain."
Sets the I/O direction of the ports and the their output type to CMOS or "Nch-open-drain" on a bit basis.
Sends and receives port data.
No.8265-8/14
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