mc68hc05p18a Freescale Semiconductor, Inc, mc68hc05p18a Datasheet - Page 80

• Manufacturer Part Number: mc68hc05p18a
• Description: Mc68hc05p18a Hcmos Microcontroller Unit
• Manufacturer: Freescale Semiconductor, Inc

Serial Input/Output Ports (SIOP)
9.4 SIOP Registers
9.4.1 SIOP Control Register
Technical Data
Address:
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
The SIOP is programmed and controlled by these registers:
This register is located at address $000A and contains two bits.
Figure 9-3
the value of each bit after reset.
Reset:
Read:
Write:
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Freescale Semiconductor, Inc.
For More Information On This Product,
SIOP control register (SCR) located at address $000A
SIOP status register (SSR) located at address $000B
SIOP data register (SDR) located at address $000C
$000A
Bit 7
0
0
Serial Input/Output Ports (SIOP)
shows the position of each bit in the register and indicates
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Figure 9-3. SIOP Control Register (SCR)
= Unimplemented
SPE
6
0
5
0
0
MSTR
4
0
Figure
3
0
0
9-2.
2
0
0
MC68HC05P18A
1
0
0
Bit 0
0
0