MC68376BGMAB20 Freescale Semiconductor, MC68376BGMAB20 Datasheet - Page 232

• Manufacturer Part Number: MC68376BGMAB20
• Description: IC MCU 32BIT 8K ROM 160-QFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68376BGMAB20

• 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: -

10.9.8 PWM Frequency
Table 10-5 PWM Pulse and Frequency Ranges (in Hz) Using
Table 10-6 PWM Pulse and Frequency Ranges (in Hz) Using
10-16
MOTOROLA
Divide
Ratio
Divide
f
Ratio
sys
f
128
512
16
32
64
sys
192
768
2
4
8
12
24
48
96
The relationship between the PWM output frequency (f
clock frequency (f
where N
N
The minimum PWM output frequency achievable with a specified number of bits of res-
olution for a given system clock frequency is:
where N
Similarly, the maximum PWM output frequency achievable with a specified number of
bits of resolution for a given system clock frequency is:
Tables 10-5 and 10-6 summarize the minimum pulse widths and frequency ranges
available from the PWMSM based on the CPSM system clock divide ratio and a
system clock frequency of 20.97 MHz.
3
6
PERIOD
Minimum
Minimum
0.095 s
0.191 s
0.381 s
0.763 s
24.42 s
Width
1.53 s
3.05 s
6.10 s
Pulse
0.179 s
0.358 s
0.715 s
1.431 s
2.861 s
5.722 s
11.44 s
45.78 s
Pulse
Width
CPSM
CLOCK
is the period specified by PWMA1.
160
16
2.5
0.6
80
40
20
10
5
107
0.4
16
53
27
13
7
3
2
is the CPSM divide ratio of two or three.
320
160
15
1.3
is the divide ratio specified by the CLK[2:0] field in PWMSIC and
80
40
20
10
224
107
5
0.8
15
53
27
13
7
3
sys
Minimum f
) is given by the following equation:
640
320
160
2.5
14
80
40
20
10
427
224
107
14
53
27
13
7
2
Maximum f
1280
CONFIGURABLE TIMER MODULE 4
640
320
160
13
80
40
20
853
427
224
107
13
5
53
27
13
3
f
PWM
PWM
2560
1280
640
320
160
1707
12
80
40
10
853
427
224
107
12
53
27
7
=
=
5120
2560
1280
3413
1707
PWM
640
320
160
11
853
427
224
107
80
20
11
53
13
---------------------------------------------- -
N
-----------------------------------------------------------------------
256N
CLOCK
10239
5120
2560
1280
3413
1707
6826
640
320
160
853
427
224
107
10
40
10
27
=
Bits of Resolution
Bits of Resolution
CPSM
------------------------------------------------------------ -
N
f
20479
10239
13652
5120
2560
1280
6826
3413
1707
sys
CPSM
640
320
853
427
224
80
53
9
9
N
PERIOD
f
40957
20479
10239
27305
13652
5120
2560
1280
6826
3413
1707
sys
2
640
160
853
427
107
8
8
Bits of Resolution
2
f
Bits of Resolution
54609
27305
13652
81914
40957
20479
10239
sys
6826
3413
1707
5120
2560
1280
320
853
224
7
7
PWM
54609
27305
13652
81914
40957
20479
10239
109K
164K
5120
2560
6826
3413
1707
427
640
6
6
) and the MCU system
54609
27305
13652
81914
40957
20479
10239
218K
109K
6826
3413
328K
164K
5120
1280
853
2 Option (20.97 MHz)
3 Option (20.97 MHz)
5
5
54609
27305
13652
81914
40957
20479
10239
437K
218K
109K
6826
1707
655K
328K
164K
2560
4
4
USER’S MANUAL
54609
27305
13652
1311K
81914
40957
20479
874K
437K
218K
109K
3413
655K
328K
164K
5120
3
3
MC68336/376
1748K
54609
27305
874K
437K
218K
109K
2621K
1311K
81914
40957
10239
6826
655K
328K
164K
2
2
3495K
1748K
54609
13652
874K
437K
218K
109K
5243K
2621K
1311K
81914
20479
655K
328K
164K
1
1