xr82c684 Exar Corporation, xr82c684 Datasheet - Page 98

• Manufacturer Part Number: xr82c684
• Description: Cmos Quad Channel Uart Quart
• Manufacturer: Exar Corporation

K. Timing Diagrams
Note: AC testing inputs are driven at 0.4V for a logic “0” and 2.4V for a logic “1” except for -40 to 85
C and -55 to 125
C,
logic “1” shall be 2.6V. Timing measurements are made at 0.8V for a logic “0” and 2.0V for a logic “1”.
XR82C684
Input Port
Change
Bit 7
Bit 7
Bit 7
Bit 7
Table 43. Counter/Timer Upper Byte Register, CTUR (applies to CTUR1 and CTUR2)
Table 44. Counter/Timer Lower Byte Register, CTLR (applies to CTLR1 and CTLR2)
Delta Break
Bit 6
Bit 6
Bit 6
Bit 6
D
Table 45. Interrupt Vector Register: IVR (applies to IVR1 and IVR2)
Figure 55. Input and Output Levels for Timing Measurements
FFULLD
RXRDY/
Bit 5
Bit 5
Bit 5
Bit 5
Table 42. Interrupt Mask Register 2, IMR2
TXRDYD
Bit 4
Bit 4
Bit 4
Bit 4
Counter #2
Ready
Bit 3
Bit 3
Bit 3
Bit 3
Delta Break
Bit 2
Bit 2
Bit 2
Bit 2
C
FFULLC
RXRDY/
Bit 1
Bit 1
Bit 1
Bit 1
TXRDYC
Bit 0
Bit 0
Bit 0
Bit 0