mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 147

• Manufacturer Part Number: mc68hc908gr8a
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

M — Mode (Character Length) Bit
WAKE — Wakeup Condition Bit
ILTY — Idle Line Type Bit
PEN — Parity Enable Bit
PTY — Parity Bit
Freescale Semiconductor
This read/write bit determines whether SCI characters are eight or nine bits long. See
ninth bit can serve as an extra stop bit, as a receiver wakeup signal, or as a parity bit. Reset clears the
M bit.
This read/write bit determines which condition wakes up the SCI: a 1 (address mark) in the most
significant bit position of a received character or an idle condition on the PTE1/RxD pin. Reset clears
the WAKE bit.
This read/write bit determines when the SCI starts counting 1s as idle character bits. The counting
begins either after the start bit or after the stop bit. If the count begins after the start bit, then a string
of 1s preceding the stop bit may cause false recognition of an idle character. Beginning the count after
the stop bit avoids false idle character recognition, but requires properly synchronized transmissions.
Reset clears the ILTY bit.
This read/write bit enables the SCI parity function. See
inserts a parity bit in the most significant bit position. See
This read/write bit determines whether the SCI generates and checks for odd parity or even parity. See
Table 13-5.
1 = 9-bit SCI characters
0 = 8-bit SCI characters
1 = Address mark wakeup
0 = Idle line wakeup
1 = Idle character bit count begins after stop bit
0 = Idle character bit count begins after start bit
1 = Parity function enabled
0 = Parity function disabled
1 = Odd parity
0 = Even parity
M
Changing the PTY bit in the middle of a transmission or reception can
generate a parity error.
0
1
0
0
1
1
Reset clears the PTY bit.
Control Bits
PEN and PTY
0X
0X
10
11
10
11
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
Table 13-5. Character Format Selection
Start
Bits
1
1
1
1
1
1
Data
Bits
NOTE
8
9
7
7
8
8
Character Format
Table 13-5.
Parity
None
None
Even
Even
Odd
Odd
Figure
13-2. Reset clears the PEN bit.
Stop
Bits
When enabled, the parity function
1
1
1
1
1
1
Character
Length
10 bits
11 bits
10 bits
10 bits
11 bits
11 bits
Table 13-5.
:
I/O Registers
The
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