參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 80/130頁
文件大小: 1200K
代理商: MC68HC05P18A
L
G
R
Serial Input/Output Ports (SIOP)
Technical Data
MC68HC05P18A
80
Serial Input/Output Ports (SIOP)
MOTOROLA
be transmitted in either most-significant bit (MSB) first format or the
least-significant bit (LSB) format.
On the first falling edge of SCK, the first data bit will be shifted out to the
SDO pin. The remaining data bits will be shifted out to the SDI pin on
subsequent falling edges of SCK. The SDO pin will present valid data at
least 100 ns before the rising edge of the SCK and remain valid for
100 ns after the rising edge of SCK. See
Figure 9-2
.
9.4 SIOP Registers
The SIOP is programmed and controlled by these registers:
SIOP control register (SCR) located at address $000A
SIOP status register (SSR) located at address $000B
SIOP data register (SDR) located at address $000C
9.4.1 SIOP Control Register
This register is located at address $000A and contains two bits.
Figure 9-3
shows the position of each bit in the register and indicates
the value of each bit after reset.
Address:
$000A
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
SPE
0
MSTR
0
0
0
0
Write:
Reset:
0
0
0
0
0
0
0
0
= Unimplemented
Figure 9-3. SIOP Control Register (SCR)
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