Low-Side Drivers - LSDRV (S12LSDRV2)
MC9S12VRP Family Reference Manual Rev. 1.3
372
NXP Semiconductors
13.1.2
Modes of Operation
The LSDRV module behaves as follows in the system operating modes:
1. MCU run mode
Setting the LSCR[LSE0] or LSCR[LSE1] bits enable the related low-side driver. The driver is
controlled by the selected source in the Port Integration Module (see PIM chapter).
2. MCU stop mode
During stop mode operation the low-side drivers are shut down, i.e. the low-side drivers are
disabled and their drivers are turned off. The bits in the data register which control the drivers
(LSDRx) are cleared automatically. After returning from stop mode the drivers are re-enabled. If
the data register bits (LSDR[LSDRn]) were chosen as source in PIM module, then the respective
low-side driver stays turned off until the software sets the associated bit in the data register
(LSDR[LSDRn]). If the timer or PWM is chosen as source, the respective low-side driver is
controlled by the timer or PWM without further handling. If it is required that the driver stays
turned off after the stop mode for this case (PWM or timer), software must take the appropriate
action to turn off the driver before entering stop mode.
13.1.3
Block Diagram
shows a block diagram of the LSDRV module. The module consists of a control and an output
stage. Internal functions can be routed to control the low-side drivers. See PIM chapter for routing options.
Figure 13-1. LSDRV Block Diagram
LS1
LSGND
LS0
Low Side Driver Control
LS1 control
LS0 control
Содержание MC9S12VRP64
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