AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 94

• Manufacturer Part Number: AT89C5131A-M
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-M

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

19.2.3
19.2.4
19.2.5
94
AT89C5130A/31A-M
SPI Serial Clock (SCK)
Slave Select (SS)
Baud Rate
This signal is used to synchronize the data movement both in and out the devices through their
MOSI and MISO lines. It is driven by the Master for eight clock cycles which allows to exchange
one byte on the serial lines.
Each Slave peripheral is selected by one Slave Select pin (SS). This signal must stay low for any
message for a Slave. It is obvious that only one Master (SS high level) can drive the network.
The Master may select each Slave device by software through port pins
vent bus conflicts on the MISO line, only one slave should be selected at a time by the Master
for a transmission.
In a Master configuration, the SS line can be used in conjunction with the MODF flag in the SPI
Status register (SPSTA) to prevent multiple masters from driving MOSI and SCK (see
Section “Error Conditions”, page 98).
A high level on the SS pin puts the MISO line of a Slave SPI in a high-impedance state.
The SS pin could be used as a general-purpose if the following conditions are met:
Notes:
In Master mode, the baud rate can be selected from a baud rate generator which is controlled by
three bits in the SPCON register: SPR2, SPR1 and SPR0. The Master clock is chosen from one
of seven clock rates resulting from the division of the internal clock by 4, 8, 16, 32, 64 or 128.
Table 19-1
Table 19-1.
• The device is configured as a Master and the SSDIS control bit in SPCON is set. This kind of
• The Device is configured as a Slave with CPHA and SSDIS control bits set
SPR2
configuration can be found when only one Master is driving the network and there is no way
that the SS pin could be pulled low. Therefore, the MODF flag in the SPSTA will never be
set
configuration can happen when the system comprises one Master and one Slave only.
Therefore, the device should always be selected and there is no reason that the Master uses
the SS pin to select the communicating Slave device.
0
0
0
0
1
1
1
(1)
.
1. Clearing SSDIS control bit does not clear MODF.
2. Special care should be taken not to set SSDIS control bit when CPHA =’0’ because in this
mode, the SS is used to start the transmission.
gives the different clock rates selected by SPR2:SPR1:SPR0:
SPR1
SPI Master Baud Rate Selection
0
0
1
1
0
0
1
SPR0
0
1
0
1
0
1
0
F
F
F
F
F
F
CLK PERIPH
Clock Rate
CLK PERIPH
CLK PERIPH
CLK PERIPH
Don’t Use
CLK PERIPH
CLK PERIPH
/128
/16
/32
/64
/4
/8
Baud Rate Divisor (BD)
(Figure
No BRG
(2)
128
16
32
64
4
8
This kind of
19-1). To pre-
4337K–USB–04/08