EM78451AP EMC [ELAN Microelectronics Corp], EM78451AP Datasheet - Page 25

• Manufacturer Part Number: EM78451AP
• Description: 8-Bit Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.2) 05.27.2004
(This specification is subject to change without further notice)
The SSE bit will be kept in 1 if the communication is still undergoing. This flag must be
cleared as the shifting is completed. Users can determine if the next write attempt is
available.
4.5.3
The detailed functions of the four pins, SDI, SDO, SCK, and /SS, which are shown in
Fig. 9, are as follows:
SDI/P92 (Pin 7):
SDO/P93 (Pin 8):
SBRS2~SBRS0: Programming the clock frequency/rates and sources.
Clock Select:Selecting either the internal or the external clock as the shifting clock.
Edge Select: Selecting the appropriate clock edges by programming the CES bit
Serial Data In,
Receive sequentially, the Most Significant Bit (MSB) first, the Least Significant Bit
Defined as high-impedance, if not selected,
Program the same clock rate and clock edge to latch on both the master and slave
The byte received will update the transmitted byte,
Both the RBF and the RBFIF bits (located in Register 0x0C) will be set as the SPI
Timing is shown in Fig.13 and Fig. 14.
Serial Data Out,
Transmit sequentially; the Most Significant Bit (MSB) first, the Least Significant Bit
Program the same clock rate and clock edge to latch on both the master and slave
The byte received will update the transmitted byte,
The CES (located in Register 0x0D) bit will be reset, as the SPI operation is
Timing is shown in Fig.13 and 14.
(LSB) last,
devices,
operation is completed.
(LSB) last,
devices,
completed.
SPI Signal & Pin Description
8-Bit Microcontroller
EM78451
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