P89LPC938FA NXP Semiconductors, P89LPC938FA Datasheet - Page 31
![IC, MCU 8BIT 80C51 8K FLASH, PLCC28](/photos/19/0/190085/ge28plcc05-40_sml.jpg)
P89LPC938FA
Manufacturer Part Number
P89LPC938FA
Description
IC, MCU 8BIT 80C51 8K FLASH, PLCC28
Manufacturer
NXP Semiconductors
Datasheet
1.P89LPC938FA.pdf
(68 pages)
Specifications of P89LPC938FA
Controller Family/series
(8051) 8052
Core Size
8bit
No. Of I/o's
26
Program Memory Size
8KB
Eeprom Memory Size
512Byte
Ram Memory Size
768Byte
Cpu Speed
18MHz
Oscillator Type
External,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
P89LPC938FA
Manufacturer:
ST
Quantity:
760
Part Number:
P89LPC938FA
Manufacturer:
NXP/恩智浦
Quantity:
20 000
Company:
Part Number:
P89LPC938FA,129
Manufacturer:
NXP Semiconductors
Quantity:
10 000
Company:
Part Number:
P89LPC938FAЈ¬129
Manufacturer:
NXP
Quantity:
1 503
Philips Semiconductors
9397 750 14051
Product data sheet
7.19.7 Alternating output mode
7.19.8 PLL operation
In asymmetrical mode, the user can set up PWM channels A/B and C/D as alternating
pairs for bridge drive control. In this mode the output of these PWM channels are
alternately gated on every counter cycle.
The PWM module features a Phase Locked Loop that can be used to generate a
CCUCLK frequency between 16 MHz and 32 MHz. At this frequency the PWM module
provides ultrasonic PWM frequency with 10-bit resolution provided that the crystal
frequency is 1 MHz or higher. The PLL is fed an input signal of 0.5 - 1 MHz and generates
an output signal of 32 times the input frequency. This signal is used to clock the timer. The
user will have to set a divider that scales PCLK by a factor of 1-16. This divider is found in
the SFR register TCR21. The PLL frequency can be expressed as shown in
Where: N is the value of PLLDV3:0.
Since N ranges in 0 - 15, the CCLK frequency can be in the range of PCLK to
PLL frequency
Fig 10. Alternate output mode.
=
----------------- -
PLCK
N
+
Rev. 01 — 25 February 2005
1
8-bit microcontroller with 10-bit A/D converter
002aaa895
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
TOR2
COMPARE VALUE A (or C)
COMPARE VALUE B (or D)
0
PWM OUTPUT A (or C) (P2.6)
PWM OUTPUT B (or D) (P1.6)
TIMER VALUE
P89LPC938
Equation
PCLK
31 of 68
16
.
1.
(1)