MC68HC705C8AB Freescale Semiconductor, MC68HC705C8AB Datasheet - Page 145

• Manufacturer Part Number: MC68HC705C8AB
• Description: IC MCU 8K OTP 2.1MHZ 42-SDIP
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8AB

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 304 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 42-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

11.5 Multiple-SPI Systems
MC68HC705C8A — Rev. 3
MOTOROLA
Example:
In a multiple-SPI system, all PD4/SCK pins are connected together, all
PD3/MOSI pins are connected together, and all PD2/MISO pins are
connected together.
Before a transmission, one SPI is configured as master and the rest are
configured as slaves.
master SPI and three slave SPIs.
Figure 11-5
three slave SPIs.
LDA #$1C
STA SPCR
LDA #$4C
STA SPCR
Freescale Semiconductor, Inc.
Figure 11-4. One Master and Three Slaves Block Diagram
For More Information On This Product,
MASTER MCU
Serial Peripheral Interface (SPI)
PD2/MISO
PD3/MOSI
PORT
Go to: www.freescale.com
PD4/SCK
is another block diagram with two master/slave SPIs and
I/O
PD5/SS
; MSTR = 1, CPOL = 1, CPHA = 1,
; SPR1 = SPR0 = 0
; SPI control register
; MSTR = 0, SPE = 1, CPOL = 1, CPHA = 1,
; SPR1 = SPR0 = 0
; SPI control register
2
1
0
Figure 11-4
V
DD
SLAVE MCU 2
is a block diagram showing a single
SLAVE MCU 1
Serial Peripheral Interface (SPI)
SLAVE MCU 0
Multiple-SPI Systems
Technical Data