572
Chapter 13
Auxiliary Frequency Output Function (AFO)
User’s Manual U16580EE3V1UD00
13.4 Operation
13.4.1 Auxiliary
frequency
output
The auxiliary frequency output (AFO) is enabled as soon as the shared port (P75) is set into control
output mode by setting bit 5 of the PM7 register to 0 and bit 5 of the PMC7 register to 1.
13.4.2 Auxiliary
frequency
generation
The auxiliary frequency output clock is generated by dividing the main clock. The baud rate generated
from the main clock is obtained by the following equation.
Remarks: 1.
f
AFO
: AFO
clock
2.
f
BGCS2
: Clock frequency selected by the BGCS21, BGCS20 bits of the PRSM2
register.
3.
f
XX
:
Main clock oscillation frequency
4.
k:
PRSM2 register setting value (2
≤
k
≤
5)
5.
N:
PRSCMm register setting value (1 to 255), when PRSCM2 = 01H to FFH,
or N = 256, when PRSCM2 = 00H.
13.4.3 Interval
timer
function
The AFO function can be used as interval timer regardless whether the auxiliary frequency output is
used or not. For this purpose an interrupt request signal (INTBRG2) is assigned, which can be handled
like any maskable interrupt.
f
AFO
f
BGCS2
N
2
×
-------------------
f
XX
2
k
N
2
×
×
--------------------------
=
=
Содержание MuPD70F3187
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Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
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Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
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