at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 197

• Manufacturer Part Number: at83c5122
• Description: At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
• Manufacturer: ATMEL Corporation

External Data Memory Read
Cycle
Serial Port Timing - Shift
Register Mode
4202E–SCR–06/06
PORT 0
PORT 2
ALE
PSEN
RD
Table 118. Symbol Description (F = 40 MHz)
Table 119. AC Parameters for a Variable Clock
OR SFR-P2
ADDRESS
Symbol
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
XLXL
Symbol
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
XLXL
A0-A7
Type
Max
Min
Min
Min
Min
T
LLAX
T
AVWL
T
LLWL
T
AVDV
Standard
T
10T - x
10T - x
Clock
2T - x
LLDV
12T
ADDRESS A8-A15 OR SFR P2
x
T
RLAZ
Parameter
Serial port clock cycle time
Output data set-up to clock rising edge
Output data hold after clock rising edge
Input data hold after clock rising edge
Clock rising edge to input data valid
X2 Clock
5 T - x
5 T- x
T - x
6 T
x
T
RLRH
X parameter
AT8xC5122/23
DATA IN
133
50
20
0
T
T
WHLH
RHDX
T
RHDZ
Units
ns
ns
ns
ns
ns
197