参数资料
型号: MC68HC05C5CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封装: DIP-40
文件页数: 41/58页
文件大小: 166K
代理商: MC68HC05C5CP
Page 40
MOTOROLA
Section 7: Simple Input/Output Port
MC68HC05C5 Specification Rev. 1.2
While the SIOP is enabled, PB5 can not be used as a standard output since that pin is
coupled to the last stage of the serial shift register. If CPOL is set, the first falling edge of
SCK will shift the first data bit out to the output pin. If CPOL is clear, the first data bit will
be on the SDO pin waiting for the transmission.
7.1.3
SDI
The SDI pin becomes an input as soon as the SIOP is enabled. New data may be
presented to the SDI pin on the falling edge of SCK. Valid data must be present at least
t
S
before the rising edge of the clock and remain valid for t
H
after the
edge.
Figure 7-2: Serial I/O Port Timing (CPOL=1)
Figure 7-3: Serial I/O Port Timing (CPOL=0)
7.2
SIOP REGISTERS
7.2.1
SIOP CONTROL REGISTER (SCR)
This register is located at address $000A and contains 3 bits.
SDO
BIT 1
BIT 2
BIT 3
BIT 7
SCK
BIT 8
SDI
BIT 1
BIT 2
BIT 3
BIT 7
BIT 8
SDO
BIT 1
BIT 2
BIT 3
BIT 7
SCK
BIT 8
SDI
BIT 1
BIT 2
BIT 3
BIT 7
BIT 8
0
MSTR
CPOL
0
SPE
$0A
0
001000
0
RESET:
Figure 7-4: SIOP Control Register
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