mc68hc912d60c Freescale Semiconductor, Inc, mc68hc912d60c Datasheet - Page 301

• Manufacturer Part Number: mc68hc912d60c
• Description: Hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

SC0DRL— MI Bus Data Register Low
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor
Push field
Pull field
RESET:
R7/T7
Bit 7
A2
—
0
R6/T6
A1
—
6
1
RAF — Receiver Active Flag
R7T7–R0T0 — Receive/Transmit Data Bits 7 to 0
This register forms the 8-bit data/address word for the MI push field
and contains the 3-bit data word received as the MI pull field.
READ: Reads access the three bits of pull field data (stored in bits
3–1) of the read-only MI Bus receive data register. Bits [7:4, 0] are a
fixed data pattern when a valid status and end-of-frame is returned. A
valid status is represented by the following data pattern: 0101 xxx1
(bits 7–0), where ‘xxx’ is the status. All ones in the receive data
register indicate that an error occurred on the MI Bus. Bits are
received LSB first by the MCU, and the status bits map as shown in
the above table.
0 = A character is not being received
1 = A character is being received
R5/T5
A0
—
5
0
Freescale Interconnect Bus
1. 20kHz bit rate requires 25µs (40kHz) time slots.
2. 25µs ÷ 16
MDL1
R4/T4
D4
0
0
1
1
—
4
1
Table 16-1. MI Bus Delay
MDL0
R3/T3
D3
S1
—
3
0
1
0
1
Delay factor Delay time
R2/T2
D2
S2
—
2
1
2
3
4
R1/T1
S3
D1
1.5625 µs
—
1
4.6875 µs
3.125 µs
Freescale Interconnect Bus
6.25 µs
SCI0/MI Bus registers
R0/T0
(2)
Bit 0
(1)
D0
—
1
Technical Data
$00C7
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