s908gz60cfa Freescale Semiconductor, Inc, s908gz60cfa Datasheet - Page 209
s908gz60cfa
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s908gz60cfa
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.S908GZ60CFA.pdf
(352 pages)
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14.8.4 ESCI Status Register 1
ESCI status register 1 (SCS1) contains flags to signal these conditions:
SCTE — ESCI Transmitter Empty Bit
TC — Transmission Complete Bit
SCRF — ESCI Receiver Full Bit
Freescale Semiconductor
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This clearable, read-only bit is set when the SCDR transfers a character to the transmit shift register.
SCTE can generate an ESCI transmitter CPU interrupt request. When the SCTIE bit in SCC2 is set,
SCTE generates an ESCI transmitter CPU interrupt request. In normal operation, clear the SCTE bit
by reading SCS1 with SCTE set and then writing to SCDR. Reset sets the SCTE bit.
This read-only bit is set when the SCTE bit is set, and no data, preamble, or break character is being
transmitted. TC generates an ESCI transmitter CPU interrupt request if the TCIE bit in SCC2 is also
set. TC is cleared automatically when data, preamble, or break is queued and ready to be sent. There
may be up to 1.5 transmitter clocks of latency between queueing data, preamble, and break and the
transmission actually starting. Reset sets the TC bit.
This clearable, read-only bit is set when the data in the receive shift register transfers to the ESCI data
register. SCRF can generate an ESCI receiver CPU interrupt request. When the SCRIE bit in SCC2 is
set the SCRF generates a CPU interrupt request. In normal operation, clear the SCRF bit by reading
SCS1 with SCRF set and then reading the SCDR. Reset clears SCRF.
1 = SCDR data transferred to transmit shift register
0 = SCDR data not transferred to transmit shift register
1 = No transmission in progress
0 = Transmission in progress
1 = Received data available in SCDR
0 = Data not available in SCDR
Transfer of SCDR data to transmit shift register complete
Transmission complete
Transfer of receive shift register data to SCDR complete
Receiver input idle
Receiver overrun
Noisy data
Framing error
Parity error
Address:
Reset:
Read:
Write:
MC68HC908GZ60 • MC68HC908GZ48 • MC68HC908GZ32 Data Sheet, Rev. 6
$0016
SCTE
Bit 7
1
Figure 14-13. ESCI Status Register 1 (SCS1)
= Unimplemented
TC
6
1
SCRF
5
0
IDLE
4
0
OR
3
0
NF
2
0
FE
1
0
Bit 0
PE
0
I/O Registers
209
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