參數(shù)資料
型號(hào): MC68HC05CL48
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.802 MHz, MICROCONTROLLER, PQFP112
封裝: TQFP-112
文件頁數(shù): 120/145頁
文件大?。?/td> 673K
代理商: MC68HC05CL48
GENERAL RELEASE SPECIFICATION
June 11, 1997
MOTOROLA
SERIAL PERIPHERAL INTERFACE
MC68HC05CL48
9-4
REV 2.0
9.2.1 SPCR SPI Control Register
SPIE SPI Interrupt Enable
When this bit is set to a one a hardware interrupt sequence is requested each
time the SPIF or MODF status ag is set. SPI interrupts are inhibited if this bit is
clear or if the I-bit in the CC-Register is one.
SPE
SPI System Enable
Setting the SPE-bit to ‘1’ will enable the SPI function and automatically
congure PTC[3:0] as dedicated SPI pins.
MSTR Master/Slave Mode Select
0 =
Slave mode
1 =
Master mode
CPOL Clock Polarity
CPHA Clock Phase
These two bits are used to specify the clock format to be used in SPI
operations. Please refer to Figure 9-1.
SPR1, SPR0 SPI Clock (SCK) Rate Select Bits
These bits are used to specify the SPI clock rate.
76543210
SPCR
$0020
READ
SPIE
SPE
-
MSTR
CPOL
CPHA
SPR1
SPR0
WRITE
RESET
00
-
001
U
Table 9-1. SPI Clock Rates
SPR1
SPR0
E Clock
divided-by
Frequency
Eclk = 1.8 MHz (baud
rate)
0
2
0.9 MHz
0
1
4
450 kHz
1
0
16
112.5 kHz
1
32
56.25 kHz
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