Philips Semiconductors
P87LPC778
CMOS single-chip 8-bit microcontroller
Product data Rev. 01 — 31 March 2004 74 of 79
9397 750 12378
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
11. Dynamic characteristics
[1] Applies only to an external clock source, not when a crystal is connected to the X1 and X2 pins.
[2] Tested at V
DD
= 5.0 V and room temperature.
[3] These parameters are characterized but not tested.
[4] These parameters are for 0°C to +70°C
Table 69: AC electrical characteristics
V
DD
= 2.7 V to 5.5 V unless otherwise specified; V
SS
= 0 V.
[1][2][3]
T
amb
=
−
40
°
C to +85
°
C for extended industrial, unless otherwise specified.
Symbol Figure Parameter Min Max Unit
External Clock
f
C
30 Oscillator frequency (V
DD
= 4.0 V to 5.5 V) 0 20 MHz
f
C
30 Oscillator frequency (V
DD
= 2.7 V to 5.5 V) 0 10 MHz
t
C
30 Clock period and CPU timing cycle 1/f
C
-ns
t
CLCX
30 Clock low-time
[1]
f
osc
= 20 MHz 20 - ns
t
CLCX
30 f
osc
= 10 MHz 40 - ns
t
CHCX
30 Clock high time
[1]
f
osc
= 20 MHz 20 - ns
t
CHCX
30 f
osc
= 10 MHz 40 - ns
Internal RC Oscillator
f
CCAL
On-chip oscillator calibration
[2]
f
RCOSC
= 6 MHz −1+1%
f
CTOL
On-chip oscillator tolerance
[3][4]
f
RCOSC
= 6 MHz −2.5 +2.5 %
f
CTOL1
On-chip oscillator tolerance
[3]
f
RCOSC
= 6 MHz −25 +25 %
Shift Register
t
XLXL
29 Serial port clock cycle time 6t
C
-ns
t
QVXH
29 Output data set-up to clock rising edge 5t
C
− 133 - ns
t
XHQX
29 Output data hold after clock rising edge 1t
C
− 80 - ns
t
XHDV
29 Input data set-up to clock rising edge - 5t
C
− 133 ns
t
XHDX
29 Input data hold after clock rising edge 0 - ns
Fig 29. Shift register mode timing.
01234567
Valid Valid Valid Valid Valid Valid Valid Valid
t
XLXL
002aaa425
Set TI
Set RI
t
XHQX
t
QVXH
t
XHDV
t
XHDX
Clock
Output Data
Write to SBUF
Input Data
Clear RI
