EM78451AP EMC [ELAN Microelectronics Corp], EM78451AP Datasheet - Page 34

• Manufacturer Part Number: EM78451AP
• Description: 8-Bit Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

EM78451
8-Bit Microcontroller
30 •
4.6 Timer 1
DELAY:
4.6.1
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,
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.
4.6.2
Fig. 15 shows TIMER1 block diagram. Each signal and block is described as follows:
BC 0x0C,1
NOP
JMP SPI
EOP
ORG 0XFFF
JMP INITI
OSC/4: Input clock.
Prescaler: Option of 1:1, 1:4, 1:8, and 1:16 defined by T1P1 and T1P02(T1CON<1,
PWP: Pulse width preset register; the desired width of baud clock is written in
TMR1: Timer 1 register; TMR1 increases until it matches with PWP, and then
0>). It is cleared when a value is written to TMR1 or T1CON, and during any kind of
reset as well.
advance.
resets to 0. If it is chosen optionally in the SPI mode, its output is fed as a shifting
clock.
Overview
Function description
Fig. 15 TIMER1 Block Diagram
; (User’s program)
(This specification is subject to change without further notice)
Product Specification (V1.2) 05.27.2004