Fujitsu FR20 User Manual

183

9.3

Operation of Real Timing Generator (RTG)

Initiation procedure of the real timing generator (RTG) and RTG output timing are
described.

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Initiation Procedure of Real Timing Generator (RTG)

1. Performs the initialization of control register.

2. Set the output data to RTGxD. In this case, do not use the command with RMW.

3. Set the output time to RTGxTH, L. In this case, the output data set by 2) is transferred to FIFO and EMP

flag becomes 0. 3 machine cycles are required for the EMP flag to be determined after setting the output

time. So if the flag is to be checked immediately after setting the output time, test should be carried out

after executing dummy read, etc.

Notes:

•

Do not use word access commands to set the output data and output time.

•

Use half-word access commands to set the output time.

•

Prior to setting up the output time, set up the output data.

Figure 9.3-1 Operation timing of FIFO

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RTG Output Timing

Figure 9.3-2 Output timing of RTG

RTGxT write
Out Data
Fifo 1st
Fifo 2nd
EMP flag
FUL flag

RTG Output

3 Machine cycle (3 x

)

XXXX

T0001

T0002

T0001

T0003

T0001

XXXX

FRC2/3
FRC value
CMP latch
FRC. EQ. TD

Output timing
RTG Output

FFFF
0000

0000

0003
nnnn

OUT(T0)