P89LPC9301(2009) View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

P89LPC9301
(Rev.:2009)

8-bit microcontroller with accelerated two-clock 80C51 core 4 kB/8 kB 3 V byte-erasable flash

NXP Semiconductors. 

NXP Semiconductors

P89LPC9301/931A1

8-bit microcontroller with accelerated two-clock 80C51 core

The boot address will be used if a UART break reset occurs, or the non-volatile boot

status bit (BOOTSTAT.0) = 1, or the device is forced into ISP mode during power-on (see

P89LPC9301/931A1 User manual). Otherwise, instructions will be fetched from address

0000H.

7.20 Timers/counters 0 and 1

The P89LPC9301/931A1 has two general purpose counter/timers which are upward

compatible with the standard 80C51 Timer 0 and Timer 1. Both can be configured to

operate either as timers or event counters. An option to automatically toggle the T0 and/or

T1 pins upon timer overflow has been added.

In the ‘Timer’ function, the register is incremented every machine cycle.

In the ‘Counter’ function, the register is incremented in response to a 1-to-0 transition at its

corresponding external input pin, T0 or T1. In this function, the external input is sampled

once during every machine cycle.

Timer 0 and Timer 1 have five operating modes (Modes 0, 1, 2, 3 and 6). Modes 0, 1, 2

and 6 are the same for both Timers/Counters. Mode 3 is different.

7.20.1 Mode 0

Putting either Timer into Mode 0 makes it look like an 8048 Timer, which is an 8-bit

Counter with a divide-by-32 prescaler. In this mode, the Timer register is configured as a

13-bit register. Mode 0 operation is the same for Timer 0 and Timer 1.

7.20.2 Mode 1

Mode 1 is the same as Mode 0, except that all 16 bits of the timer register are used.

7.20.3 Mode 2

Mode 2 configures the Timer register as an 8-bit Counter with automatic reload. Mode 2

operation is the same for Timer 0 and Timer 1.

7.20.4 Mode 3

When Timer 1 is in Mode 3 it is stopped. Timer 0 in Mode 3 forms two separate 8-bit

counters and is provided for applications that require an extra 8-bit timer. When Timer 1 is

in Mode 3 it can still be used by the serial port as a baud rate generator.

7.20.5 Mode 6

In this mode, the corresponding timer can be changed to a PWM with a full period of

256 timer clocks.

7.20.6 Timer overflow toggle output

Timers 0 and 1 can be configured to automatically toggle a port output whenever a timer

overflow occurs. The same device pins that are used for the T0 and T1 count inputs are

also used for the timer toggle outputs. The port outputs will be a logic 1 prior to the first

timer overflow when this mode is turned on.

P89LPC9301_931A1_1

Preliminary data sheet

Rev. 01 — 9 April 2009

© NXP B.V. 2009. All rights reserved.

27 of 65

Share Link: