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參數(shù)資料
| 型號(hào)： | EM78P451 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features; Temperature Range: 0°C to 70°C; Package: 16-QFN |
| 中文描述： | 8位微控制器的通用產(chǎn)品[英文] |
| 文件頁(yè)數(shù)： | 26/52頁(yè) |
| 文件大小： | 1287K |
| 代理商： | EM78P451 |
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EM78P451
OTP ROM
This specification is subject to change without prior notice.
2002/03/01
32
4.6 Timer 1
1. Overview
Timer1(TMR1) is an eight-bit clock counter with a programmable prescaler. It is designed for the SPI
module as a baud rate clock generator. TMR1 can be read and written and cleared on any reset
conditions. If employed, it can be turned down for power saving by setting TMR1EN bit [T1CON<2>]
to 0.
2. Function description
Fig. 15 shows TIMER1 block diagram. Each signal and block is described as follows:
Fig. 15 TIMER1 Block Diagram
OSC/4:
Input clock.
Prescaler: Option of 1:1, 1:4, 1:8, and 1:16 defined by T1P1 and T1P02 (T1CON<1, 0>). It is
cleared when a value is written to TMR1 or T1CON, and during any kind of reset as well.
PWP: Pulse width preset register. The desired width of baud clock is written in advance.
TMR1: Timer 1 register. TMR1 increases until it matches with PWP, and then resets to 0. If it is
chosen optionally in the SPI mode, its output is fed as a shifting clock.
Comparator: To change the output status while a match occurs. The TMR1IF flag will be set at the
same time.
3. Programmed the related registers
The related registers of the defining TMR1 operation are shown in Table 4 and Table 5
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