Rainbow-electronics T89C51AC2 Bedienungsanleitung PDF herunterladen (Seite 102)

102

T89C51AC2

Rev. B – 19-Dec-01

18.4.6 External Data Memory

Read Cycle

18.4.7 Serial Port Timing -

Shift Register Mode

Table 65. Symbol Description (F= 40 MHz)

Table 66. AC Parameters for a Fix Clock (F= 40 MHz)

Table 67. AC Parameters for a Variable Clock

ALE

PSEN

PORT 0

PORT 2

A0-A7 DATA IN

ADDRESS

OR SFR-P2

AVWL

LLWL

RLAZ

ADDRESS A8-A15 OR SFR P2

RHDZ

WHLH

RLRH

LLDV

RHDX

LLAX

AVDV

Symbol Parameter

XLXL

Serial port clock cycle time

QVHX

Output data set-up to clock rising edge

XHQX

Output data hold after clock rising edge

XHDX

Input data hold after clock rising edge

XHDV

Clock rising edge to input data valid

Symbol

Min Max

Units

XLXL

300 ns

QVHX

200 ns

XHQX

30 ns

XHDX

0ns

XHDV

117 ns

Symbol Type

Standard

Clock X2 Clock

X parameter

for -M range Units

XLXL

Min 12T 6T ns

QVHX

Min 10T-x 5T-x 50 ns

XHQX

Min 2 T - x T - x 20 ns

XHDX

Min x x 0 ns

XHDV

Max 10 T - x 5 T- x 133 ns

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 108 109 110

T89C51AC2 1

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