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| 型號： | EM78P451SAQ |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-Bit Microcontroller with OTP ROM |
| 中文描述： | 8位微控制器的OTP ROM的 |
| 文件頁數(shù)： | 34/54頁 |
| 文件大?。?/td> | 421K |
| 代理商： | EM78P451SAQ |
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EM78P451S
8-Bit Microcontroller with OTP ROM
4.6 Timer 1
30
Product Specification (V1.0) 06.01.2004
(This specification is subject to change without further notice)
4.6.1 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.
increase
4.6.2 Function description
PWP
Fig. 15 shows TIMER1 block diagram. Each signal and block is described as follows:
TMR1
Sets TMR1IF
Clock output
OSC/4
OSC/2
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.
4.6.3 Programmed the related registers
The related registers of the defining TMR1 operation are shown in Table 4 and Table 5
Table 4 Related Control Registers of the TMR1
Name
Bit 7
Bit 6
Address
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0x0C
SPIS/RC
0
0
0
TM1IF
OD3
OD4
RBFIF
RBF
0x0F
INTC/IOCF
0
0
0
0
TM1IE
SPIIE
EXIE
TCIE
Table 5 Related Status/Data Registers ofTMR1
Name
Bit 7
Bit 6
Address
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0X0E
TMR1/RE
TMR17
TMR16
TMR15
TMR14
TMR13
TMR12
TMR11
TMR10
0x0F
PWP/RF
PWP7
PWP6
PWP5
PWP4
PWP3
PWP2
PWP1
PWP0
0x0C
T1CON/IOCC
0
0
0
0
0
TM1E
TM1P1
TM1P0
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