MC68HC05PV8 Datasheet, PDF (107/196 Pages) Freescale Semiconductor, Inc – Techinal Data - rev 1.9

Freescale Semiconductor, Inc.
Input/Output Ports
Port C (High Voltage Port)
the software should take care to switch off the driver as soon as possible
whenever a short-circuit occurs. To detect such a condition the PC4CL
(Bit 6) in the Interrupt Status Register should be polled.
$0029 Bit 7
6
5
4
3
2
1
Bit 0
Read: RCON PC4CL
0
0
0
HTIF HVIF LVIF
Write:
Reset: NA
0/1
0
0
0
?
0
0
Figure 7-13 Interrupt Status Register (INTSR)
MC68HC(8)05PV8 (maskset J47D and J31D):
PC4CL - Port C4 in current limit mode
1 = current on PC4 exceeds limit
0 = current on PC4 below limit
MC68HC05PV8A (maskset K20R):
PC4CL - Port C4 in current limit mode
1 = current on PC4 below limit
0 = current on PC4 exceeds limit
If the timer input capture 1 is configured to Port C4, the state of the PC4
pin is transfered to the timer module input capture, the input status can
be polled by reading the TCAP1 bit in the Port B Data Register.
7.6.5 Port C Low Side Driver
The port C pins PC5–6 comprise of two low side driver channels which
are shared with the PWM function. The channels can either be controlled
directly by the data register or are linked to the PWM function (see 7.6.2
Port C PWM Channel).
The low side driver channels are open-drain outputs with an internal
Zener diode. The diode clamps the maximum output voltage and limits
the turn-off time of inductive loads (see Figure 7-14).
MC68HC(8)05PV8/A — Rev. 1.9
Input/Output Ports
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Technical Data