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Data Sheet Revision 1.0
Page 4
OX16C954 rev B
OXFORD SEMICONDUCTOR LTD.
14.5
14.6
14.7
15
ADDITIONAL FEATURES ................................................................................................................................................................37
15.1
Additional Status Register ‘ASR’...........................................................................................................................................37
15.2
FIFO Fill levels ‘TFL & RFL’.....................................................................................................................................................37
15.3
Additional Control Register ‘ACR’.........................................................................................................................................37
15.4
Transmitter Trigger Level ‘TTL’..............................................................................................................................................39
15.5
Receiver Interrupt. Trigger Level ‘RTL’.................................................................................................................................39
15.6
Flow Control Levels ‘FCL’ & ‘FCH’ ........................................................................................................................................39
15.7
Device Identification Registers..............................................................................................................................................39
15.8
Clock Select Register ‘CKS’....................................................................................................................................................40
15.9
Nine-bit Mode Register ‘NMR’.................................................................................................................................................40
15.10
Modem Disable Mask ‘MDM..............................................................................................................................................41
15.11
Readable FCR ‘RFC’ ............................................................................................................................................................41
15.12
Good-data status register ‘GDS’ .......................................................................................................................................41
15.13
DMA Status Register ‘DMS’................................................................................................................................................42
15.14
Port Index Register ‘PIX’.....................................................................................................................................................42
15.15
Clock Alteration Register ‘CKA’........................................................................................................................................42
16
OPERATING CONDITIONS..............................................................................................................................................................43
17
DC ELECTRICAL CHARACTERISTICS .........................................................................................................................................44
17.1
5V Operation..............................................................................................................................................................................44
17.2
3.3V Operation...........................................................................................................................................................................45
18
AC ELECTRICAL CHARACTERISTICS .........................................................................................................................................46
18.1
5V Operation..............................................................................................................................................................................46
18.2
3.3V Operation...........................................................................................................................................................................47
19
TIMING WAVEFORMS......................................................................................................................................................................48
20
PACKAGE INFORMATION...............................................................................................................................................................50
21
ORDERING INFORMATION.............................................................................................................................................................52
NOTES ......................................................................................................................................................................................................53
CONTACT DETAILS................................................................................................................................................................................54
TTL Clock Mode........................................................................................................................................................................36
External 1x Clock Mode...........................................................................................................................................................36
Crystal Oscillator Circuit.........................................................................................................................................................36