tmp88f846ug TOSHIBA Semiconductor CORPORATION, tmp88f846ug Datasheet - Page 142

• Manufacturer Part Number: tmp88f846ug
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

driver)
14. Motor Control Circuit (PMD: Programmable motor
14.5.4 Protective Circuit
Overload protective input CL
Timer 1 interrupt INTTMR1
by driving their respective port inputs active.
PWM synchronizing
clock PWM sync
Overload protective
interrupt INTCLM
This circuit consists of an EMG protective circuit and overload protective circuit. These circuits are activated
a. EMG protective circuit
b. Overload protective circuit
Stop MDCNT
When the signal on EMG input port goes active (negative edge triggered), the six ports are immedi-
ately disabled high-impedance against output and an EMG interrupt (INTEMG) is generated. The
EMG Control Register (EMGCRA) is used to set EMG protection. If the EMGCRA<EMGST>
shows the value “1” when read, it means that the EMG protective circuit is operating. To return from
the EMG protective state, reset the MDOUT Register bits A to 0 and set the EMGCRA<RTE> to 1.
Returning from the EMG protective state is effective when the EMG protective input has been
released back high. To disable the EMG function, set data “5AH“ and “A5H“sequentially in the
EMG disable Register (EMGREL) and reset the EMGCRA<EMGEN> to 0. When the EMG func-
tion is disabled, EMG interrupts (INTEMG) are not generated.
vate overload protection, set the EMGCRB<CLEN> to 1 to enable the overload protective circuit.
The circuit starts operating when the overload protective input is pulled low.
(EMGCRB<RTTM1>), return by PWM sync (EMGCRB<RTPWM>), or return manually
(EMGCRB<RTCL>). These methods are usable when the overload protective input has been
released back high.
This protective circuit is used for emergency stop, when the EMG protective circuit is enabled.
The EMG protective circuit is initially enabled. Before disabling it, fully study on adequacy.
The overload protective circuit is set by using the EMG Control Registers (EMGCRA/B). To acti-
To return from overload state, there are three methods to use: return by a timer
Figure 14-13 Configuration of the Protective Circuit
u
x
v
y
w
z
control
Reset
7
2
6, 5
EMGCRB
4
3, 2, 1, 0
EMG control register
CL detection
protective
Overload
control
4
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7, 6, 5, 4
4
EMGCRA
Under
prote-
ction
−
2 1 0
protective
control
2
EMG
EMG disable code register
7, 6, 5, 4, 3, 2, 1, 0
8
EMGREL
EMG
EMG input
INTEMG
EMG interrupt
u'
x'
v'
y'
w'
z'
TMP88F846UG
A to 0
MDOUT
Set "0"