Device Overview S12VRP-Series
MC9S12VRP Family Reference Manual Rev. 1.3
NXP Semiconductors
39
1.9
Modes of Operation
The MCU can operate in different modes. These are described in
1.9.1 Chip Configuration Summary
The MCU can operate in different power modes to facilitate power saving when full system performance
is not required. These are described in
.
Some modules feature a software programmable option to freeze the module status whilst the background
debug module is active to facilitate debugging.
1.9.1
Chip Configuration Summary
The different modes and the security state of the MCU affect the debug features (enabled or disabled).
The operating mode out of reset is determined by the state of the MODC signal during reset (see
). The MODC bit in the MODE register shows the current operating mode and provides limited
mode switching during operation. The state of the MODC signal is latched into this bit on the rising edge
of RESET.
1.9.1.1
Normal Single-Chip Mode
This mode is intended for normal device operation. The opcode from the on-chip memory is being
executed after reset (requires the reset vector to be programmed correctly). The processor program is
executed from internal memory.
1.9.1.2
Special Single-Chip Mode
This mode is used for debugging single-chip operation, boot-strapping, or security related operations. The
background debug module BDM is active in this mode. The CPU executes a monitor program located in
an on-chip ROM. BDM firmware waits for additional serial commands through the BKGD pin.
1.9.2
Low Power Operation
The S12VRP-Series has two dynamic-power modes (run and wait) and two static low-power modes stop
and pseudo stop). For a detailed description refer to
Chapter 4, “S12 Clock, Reset and Power Management
.
•
Dynamic power mode: Run
— Run mode is the main full performance operating mode with the entire device clocked. The user
can configure the device operating speed through selection of the clock source and the phase
locked loop (PLL) frequency. To save power, unused peripherals must not be enabled.
Table 1-9. Chip Modes
Chip Modes
MODC
Normal single chip
1
Special single chip
0
Содержание MC9S12VRP64
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