s908gr16ag4cfj Freescale Semiconductor, Inc, s908gr16ag4cfj Datasheet - Page 158

• Manufacturer Part Number: s908gr16ag4cfj
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Enhanced Serial Communications Interface (ESCI) Module
WAKE — Wakeup Condition Bit
ILTY — Idle Line Type Bit
PEN — Parity Enable Bit
PTY — Parity Bit
14.8.2 ESCI Control Register 2
ESCI control register 2 (SCC2):
158
This read/write bit determines which condition wakes up the ESCI: a 1 (address mark) in the MSB
position of a received character or an idle condition on the RxD pin. Reset clears the WAKE bit.
This read/write bit determines when the ESCI 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 ESCI parity function (see
function inserts a parity bit in the MSB position (see
This read/write bit determines whether the ESCI generates and checks for odd parity or even parity
(see
•
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
Enables these CPU interrupt requests:
–
–
–
–
Table
SCTE bit to generate transmitter CPU interrupt requests
TC bit to generate transmitter CPU interrupt requests
SCRF bit to generate receiver CPU interrupt requests
IDLE bit to generate receiver CPU interrupt requests
14-5). Reset clears the PTY bit.
Changing the PTY bit in the middle of a transmission or reception can
generate a parity error.
M
0
1
0
0
1
1
Control Bits
PEN:PTY
0 X
0 X
1 0
1 1
1 0
1 1
Table 14-5. Character Format Selection
Start Bits
MC68HC908GR16A Data Sheet, Rev. 1.0
1
1
1
1
1
1
Data Bits
8
9
7
7
8
8
NOTE
Character Format
Parity
None
None
Even
Even
Odd
Odd
Table
Table
Stop Bits
14-3). Reset clears the PEN bit.
1
1
1
1
1
1
14-5). When enabled, the parity
Character Length
10 bits
11 bits
10 bits
10 bits
11 bits
11 bits
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