MC68332ACFC25 Freescale Semiconductor, MC68332ACFC25 Datasheet - Page 167

• Manufacturer Part Number: MC68332ACFC25
• Description: IC MCU 32BIT 25MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68332ACFC25

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SCI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Type: ROMless
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 132-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

7.6.1.3 Emulation Control
7.6.1.4 Low-Power Stop Control
MC68332
USER’S MANUAL
EXTERNAL
When the T2CG bit is set, the external TCR2 pin functions as a gate of the DIV8 clock
(the TPU system clock divided by 8). In this case, when the external TCR2 pin is low,
the DIV8 clock is blocked, preventing it from incrementing TCR2. When the external
TCR2 pin is high, TCR2 is incremented at the frequency of the DIV8 clock. When
T2CG is cleared, an external clock from the TCR2 pin, which has been synchronized
and fed through a digital filter, increments TCR2.
The TCR2 field in TPUMCR specifies the value of the prescaler: 1, 2, 4, or 8. Channels
using TCR2 have the capability to resolve down to the TPU system clock divided by
8. Table 7-2 is a summary of prescaler output.
Asserting the EMU bit in the TPUMCR places the TPU in emulation mode. In emula-
tion mode, the TPU executes microinstructions from TPURAM exclusively. Access to
the TPURAM module through the IMB by a host is blocked, and the TPURAM module
is dedicated for use by the TPU. After reset, EMU can be written only once.
If the STOP bit in the TPUMCR is set, the TPU shuts down its internal clocks, shutting
down the internal microengine. TCR1 and TCR2 cease to increment and retain the last
value before the stop condition was entered. The TPU asserts the stop flag (STF) in
the TPUMCR to indicate that it has stopped.
INT CLK /8
TCR2 PIN
TCR2 Prescaler
SYNCHRONIZER
00
01
10
11
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 7-3 TCR2 Prescaler Control
Table 7-2 TCR2 Prescaler Control
DIGITAL
FILTER
Divide By
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TIME PROCESSOR UNIT
1
2
4
8
A
B
(T2CG CONTROL BIT)
Internal Clock
Divided By
CONTROL
MUX
0 – A
1 – B
16
32
64
8
PRESCALER
00 1
01 2
10 4
11 8
TCR2
External Clock
Divided By
1
2
4
8
0
PRESCALER CTL BLOCK 2
TCR2
15
7-13