MC68376BAMAB20 Freescale Semiconductor, MC68376BAMAB20 Datasheet - Page 248

• Manufacturer Part Number: MC68376BAMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BAMAB20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CAN, EBI/EMI, SCI, SPI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Type: ROMless
• Ram Size: 7.5K x 8
• Voltage - Supply (vcc/vdd): 4.75 V ~ 5.25 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

11.6.1.2 Prescaler Control for TCR2
11-14
MOTOROLA
T2CLK
DIV8 CLK
PIN
SYSTEM
TCR1 have the capability to resolve down to the TPU system clock divided by 4. Refer
to Figure 11-2 and Table 11-1.
Timer count register two (TCR2), like TCR1, is clocked from the output of a prescaler.
The T2CG bit in TPUMCR determines whether the T2CLK pin functions as an external
clock source for TCR2 or as the gate in the use of TCR2 as a gated pulse accumulator.
The function of the T2CG bit is shown in Figure 11-3.
CLOCK
Prescaler
SYNCHRONIZER
TCR1
00
01
10
11
32
4
Divide
By
Figure 11-2 TCR1 Prescaler Control
Figure 11-3 TCR2 Prescaler Control
1
2
4
8
DIV32 CLOCK
DIV4 CLOCK
Table 11-1 TCR1 Prescaler Control
DIGITAL
FILTER
TIME PROCESSOR UNIT
Number of
Clocks
128
256
32
64
1 – DIV4
0 – DIV32
PSCK
MUX
PSCK = 0
20.97 MHz
Rate at
12.8 s
1.6 s
3.2 s
6.4 s
A
B
T2CG CONTROL BIT
CONTROL
0 – A
1 – B
MUX
PRESCALER
00 1
01 2
10 4
11 8
TCR1
Number of
Clocks
16
32
4
8
PRESCALER
00 1
01 2
10 4
11 8
TCR2
PSCK = 1
0
USER’S MANUAL
20.97 MHz
TCR1
Rate at
200 ns
400 ns
0.8 s
1.6 s
MC68336/376
15
TPU PRE BLOCK 1
TCR2
TPU PRE BLOCK 2
15
0