mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 273
mc68hc708mp16
Manufacturer Part Number
mc68hc708mp16
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC708MP16.pdf
(398 pages)
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13.13 I/O Signals
13.13.1 MISO (Master In/Slave Out)
MC68HC708MP16
Freescale Semiconductor
—
Rev. 3.1
The SPI module has five I/O pins and shares four of them with a parallel
I/O port.
The SPI has limited inter-integrated circuit (I
software support) as a master in a single-master environment. To
communicate with I
when the SPWOM bit in the SPI control register is set. In I
communication, the MOSI and MISO pins are connected to a
bidirectional pin from the I
V
MISO is one of the two SPI module pins that transmits serial data. In full
duplex operation, the MISO pin of the master SPI module is connected
to the MISO pin of the slave SPI module. The master SPI simultaneously
receives data on its MISO pin and transmits data from its MOSI pin.
Slave output data on the MISO pin is enabled only when the SPI is
configured as a slave. The SPI is configured as a slave when its
SPMSTR bit is logic 0 and its SS pin is at logic 0. To support a multiple-
slave system, a logic 1 on the SS pin puts the MISO pin in a high-
impedance state.
When enabled, the SPI controls data direction of the MISO pin
regardless of the state of the data direction register of the shared I/O
port.
DD
•
•
•
•
•
.
MISO — Data received
MOSI — Data transmitted
SPSCK — Serial clock
SS — Slave select
CGND — Clock ground
Serial Peripheral Interface Module (SPI)
2
C peripherals, MOSI becomes an open-drain output
2
C peripheral and through a pullup resistor to
Serial Peripheral Interface Module (SPI)
2
C) capability (requiring
2
Technical Data
C
273
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