MAXQ61CA MAXIM [Maxim Integrated Products], MAXQ61CA Datasheet - Page 19

• Manufacturer Part Number: MAXQ61CA
• Description: 16-Bit Microcontroller with Infrared Module
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 7. SPI Master Communication Timing
The device provides two USART peripherals with the fol-
lowing features:
• 2-wire interface
• Full-duplex operation for asynchronous data transfers
• Half-duplex operation for synchronous data transfers
• Programmable interrupt when transmit or receive data
• Independent programmable baud-rate generator
• Optional 9th bit parity support
• Start/stop bit support
Table 2. USART Mode Details
operation completes
Mode 0
Mode 1
Mode 2
Mode 3
MODE
CKPOL/CKPHA
CKPOL/CKPHA
16-Bit Microcontroller with Infrared Module
0/1 OR 1/0
0/0 OR 1/1
SCLK
SCLK
MOSI
MISO
SSEL
______________________________________________________________________________________
Asynchronous
Asynchronous
Asynchronous
Synchronous
SHIFT
TYPE
t
MSB
MIS
SAMPLE
t
MCK
MSB
t
MOH
t
MCH
USART
SHIFT
t
MCL
t
MOV
MSB-1
SAMPLE
MSB-1
START BITS
N/A
The integrated SPI provides an independent serial
communication channel that communicates synchro-
nously with peripheral devices in a multiple master or
multiple slave system. The interface allows access to
a 4-wire, full-duplex serial bus, and can be operated in
either master mode or slave mode. Collision detection
is provided when two or more masters attempt a data
transfer at the same time.
The maximum SPI master transfer rate is Sysclk/2. When
operating as an SPI slave, the device can support up to
Sysclk/4 SPI transfer rate. Data is transferred as an 8-bit
or 16-bit value, MSB first. In addition, the SPI module
supports configuration of an active SSEL state (active
low or active high) through the slave active select.
1
1
1
t
MIH
Serial Peripheral Interface (SPI)
t
RF
LSB
DATA BITS
LSB
8 + 1
8 + 1
8
8
t
MLH
STOP BITS
N/A
1
1
1
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