MC68HC908GT16CB Freescale Semiconductor, MC68HC908GT16CB Datasheet - Page 191
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MC68HC908GT16CB
Manufacturer Part Number
MC68HC908GT16CB
Description
IC MCU 16K FLASH 8MHZ SPI 42-DIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908GT8CFBE.pdf
(292 pages)
Specifications of MC68HC908GT16CB
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
36
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
42-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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Protecting flags in break mode ensures that set flags will not be cleared while in break mode. This
protection allows registers to be freely read and written during break mode without losing status flag
information.
Setting the BCFE bit enables the clearing mechanisms. Once cleared in break mode, a flag remains
cleared even when break mode is exited. Status flags with a 2-step clearing mechanism — for example,
a read of one register followed by the read or write of another — are protected, even when the first step
is accomplished prior to entering break mode. Upon leaving break mode, execution of the second step
will clear the flag as normal.
15.6 Low-Power Modes
Executing the WAIT or STOP instruction puts the MCU in a low power-consumption mode for standby
situations. The SIM holds the CPU in a non-clocked state. The operation of each of these modes is
described in the following subsections. Both STOP and WAIT clear the interrupt mask (I) in the condition
code register, allowing interrupts to occur.
15.6.1 Wait Mode
In wait mode, the CPU clocks are inactive while the peripheral clocks continue to run.
the timing for wait mode entry.
A module that is active during wait mode can wake up the CPU with an interrupt if the interrupt is enabled.
Stacking for the interrupt begins one cycle after the WAIT instruction during which the interrupt occurred.
In wait mode, the CPU clocks are inactive. Refer to the wait mode subsection of each module to see if the
module is active or inactive in wait mode. Some modules can be programmed to be active in wait mode.
Wait mode also can be exited by a reset or break. A break interrupt during wait mode sets the SIM break
stop/wait bit, SBSW, in the SIM break status register (SBSR). If the COP disable bit, COPD, in the
CONFIG1 register is 0, then the computer operating properly module (COP) is enabled and remains
active in wait mode.
Figure 15-16
Freescale Semiconductor
and
R/W
Figure 15-17
IAB
IDB
Note:
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
Previous data can be operand data or the WAIT opcode, depending on the
last instruction.
WAIT ADDR
show the timing for WAIT recovery.
PREVIOUS DATA
Figure 15-15. Wait Mode Entry Timing
WAIT ADDR + 1
NEXT OPCODE
SAME
SAME
SAME
SAME
Figure 15-15
Low-Power Modes
shows
191
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