Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface
16.3
Interface Description
16.3.1 SPI Block Signals
Table 16.1 shows the SPI Block signals. Note that these signals are internal to LPC47N350.
Table 16.1 SPI Block Signals
SIGNAL
DIRECTION
DESCRIPTION
SPDO
O
Serial Data Out.
1.
2.
SPDIN1
SPDIN2
I
Serial Data In 1. Input in full-duplex mode.
Serial Data In 2. Input in bi-direction mode.
Serial Clock
3.
SPCLKO
O
4.
BIOEN
SPDOUT Output enable in bi-directional mode
Output to GPIO vs. SPDIN Function Control
Clock Input from Ring Oscillator
48MHz Clock Input from PLL
SPICR register select input
SPISR register select input
SPIDR register select input
SPICC register select input
SPIBR register select input
SPI Data Out
5.
SPIMODE
ROSC
6.
I
7.
48MHz_IN
REG_BB_SEL
REG_BC_SEL
REG_BD_SEL
REG_BE_SEL
REG_BF_SEL
SPI_DO [7:0]
SPI_DI [7:0]
nRD
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
O
I
SPI Data Input
Read Strobe
nWRT
Write Strobe
SPINT
O
I
Interrupt output to 8051
PWRDWN
RESET
MISC10 Bit from Multiplexing_2 Register
VCC1 POR signal
16.3.2 SPI Pins
The following subsections describe the SPI Pins.
Revision 1.1 (01-14-03)
176
SMSC LPC47N350
DATASHEET
SMSC [ SMSC CORPORATION ]
