EM78452WM datasheet(35/54 Pages) EMC

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EM78452

8-Bit Microcontroller

Product Specification (V1.0) 10.18.2007

• 31

(This specification is subject to change without further notice)

OSC/4: Input clock.

Prescaler: Option of 1:1, 1:4, 1:8, and 1:16 defined by T1P1 and T1P2 (T1CON<1, 0>). It

is cleared when a value is written to TMR1 or T1CON, and during any kind of reset as well.

TMR1: Timer 1 register. TMR1 increases until it overflows, and then resets to 0. If

it is in the SPI baud rate generator mode, its output is fed as a shifting clock. TMR1

value is written to Timer 1, the predicted value and TMR1 value will be the set

value. However, If TRIOS is set to “1” and value is read from TMR1, the value will

be TMR1 direct value. Or else, TRIOS is set to “0” and the value is read from

TMR1, the value will be TMR1 predicted value.

5.6.3 Programming the Related Registers

The related registers of the defining TMR1 operation are shown in Table 4 and Table 5

Table 3 Related Control Registers of the TMR1

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0x0C

SPIS/RC

DORD

TD1

TD0

T1ROS

OD3

OD4

RBF

0x0F

INTC/IOCF

TM1IE

SPIIE

EXIE

TCIE

Table 4 Related Status/Data Registers ofTMR1

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0X0E

TMR1/RE

TMR17 TMR16 TMR15 TMR14 TMR13 TMR12 TMR11 TMR10

0x0C

T1CON/IOCC

TM1E

TM1P1 TM1P0

TMR1: Timer 1 Register

TMR17~TMR10 are bit set of Timer1 register and it increases until the value

matches PWP and then it resets to 0.

T1ROS (Bit 3): Timer Read Buffer Select Bit

0: Read Value from Timer 1 Preset Register

1: Read Value from Timer 1 Counter Register.

T1CON: Timer 1 Control Register

Bit 2 (TM1E): Timer1 enable bit

Bit 1 (TM1P1) and Bit 0 (TM1P): Timer 1 prescaler for FSCO

TM1P1

TM1P0

Prescaler Rate

1:1

1:4

1:8

1:16

EM78452WM Datasheet(PDF) 35 Page - ELAN Microelectronics Corp

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