82374EB datasheet(78/208 Pages) INTEL

78 / 208 page

82374EB82374SB

334 TMSTATTIMER STATUS BYTE FORMAT REGISTER

040hTimer 1 Counter 0

041hTimer 1 Counter 1

042hTimer 1 Counter 2

048hTimer 2 Counter 0

04AhTimer 2 Counter 2

Default Value

0xxxxxxxb

Attribute

Read Only

Size

8 Bits per counter

Each Counter’s Status Byte may be read following an Timer Read-Back Command The Read-Back command

is programmed through the counter control register If ‘‘Latch Status’’ is chosen as a Read-Back option for a

given counter the next read from the counter’s IO port address returns the Status byte

The Status byte returns the countdown type either BCD or binary the Counter Operational Mode the Read

Write Selection status the Null count also referred to as the Count Register Status and the current State of

the counter OUT pin

Bit

Description

Counter OUT Pin State

When this bit is a 1 the OUT pin of the counter is also a 1 When this bit is a

0 the OUT pin of the counter is also a 0

Count Register Status

Also referred to as Null Count indicates when the last count written to the

Count Register (CR) has been loaded into the counting element (CE) The exact time this happens

depends on the counter Mode and is described in the Mode definitions but until the count is loaded

into the counting element (CE) it can’t be read from the counter If the count is latched or read before

the load time the count value returned will not reflect the new count written to the register When bit 6

is a 0 the count has been transferred from CR to CE and is available for reading When bit 6 is a 1 the

Null count condition exists The count has not been transferred from CR to CE and is not yet available

for reading

ReadWrite Status

Bits 54 reflect the readwrite selection made through bits 54 of the control

counter readwrite selection

Mode Selection Status

Bits 31 return the counter mode programming The binary code returned

matches the code used to program the counter mode as listed under the bit function above

Countdown Type Status

Bit 0 reflects the current countdown type either 0 for binary countdown or a

1 for binary coded decimal (BCD) countdown

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