BS85B12-3 HOLTEK [Holtek Semiconductor Inc], BS85B12-3 Datasheet - Page 74

• Manufacturer Part Number: BS85B12-3
• Description: Touch Key Flash Type 8-Bit MCU with LCD/LED Driver
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Note:
Rev. 1.00
TM O/P Pin
Flag TnPF
Flag TnAF
CCRP Int.
CCRA Int.
TnPAU
TnPOL
0x3FF
CCRP
CCRA
TnON
Counter Value
1. With TnCCLR=0, a Comparator P match will clear the counter
2. The TM output pin is controlled only by the TnAF flag
3. The output pin is reset to its initial state by a TnON bit rising edge
Output pin set to
initial Level Low
if TnOC=0
If the TnCCLR bit in the TMnC1 register is high then the counter will be cleared when a compare
match occurs from Comparator A. However, here only the TnAF interrupt request flag will be
generated even if the value of the CCRP bits is less than that of the CCRA registers. Therefore when
TnCCLR is high no TnPF interrupt request flag will be generated. If the CCRA bits are all zero, the
counter will overflow when its reaches its maximum 10-bit, 3FF Hex, value, however here the TnAF
interrupt request flag will not be generated.
As the name of the mode suggests, after a comparison is made, the TM output pin will change state.
The TM output pin condition however only changes state when an TnAF interrupt request flag is
generated after a compare match occurs from Comparator A. The TnPF interrupt request flag,
generated from a compare match occurs from Comparator P, will have no effect on the TM output pin.
The way in which the TM output pin changes state are determined by the condition of the TnIO1 and
TnIO0 bits in the TMnC1 register. The TM output pin can be selected using the TnIO1 and TnIO0 bits
to go high, to go low or to toggle from its present condition when a compare match occurs from
Comparator A. The initial condition of the TM output pin, which is setup after the TnON bit changes
from low to high, is setup using the TnOC bit. Note that if the TnIO1 and TnIO0 bits are zero then no
pin change will take place.
CCRP=0
Counter overflow
Here TnIO [1:0] = 11
Toggle Output select
Touch Key Flash MCU with LCD/LED Driver
Output Toggle with
TnAF flag
Compare Match Output Mode -- TnCCLR = 0
CCRP > 0
Note TnIO [1:0] = 10
Active High Output select
CCRP > 0
Counter cleared by CCRP value
68
Output not affected by TnAF
flag. Remains High until reset
by TnON bit
Pause
Resume
BS85B12-3/BS85C20-3
TnCCLR = 0; TnM [1:0] = 00
Stop
Output controlled by
other pin-shared function
Counter
Restart
Output Pin
Reset to Initial value
February 1, 2011
Output Inverts
when TnPOL is high
Time