MC68332ACEH20 Freescale Semiconductor, MC68332ACEH20 Datasheet - Page 166

• Manufacturer Part Number: MC68332ACEH20
• Description: IC MCU 32BIT 20MHZ 132-PQFP
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68332ACEH20

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 20MHz
• 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
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 20 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Interface Type: SCI, SPI, UART
• Minimum Operating Temperature: - 40 C
• Controller Family/series: 68K
• No. Of I/o's: 15
• Ram Memory Size: 2KB
• Cpu Speed: 20MHz
• No. Of Timers: 1
• Embedded Interface Type: QSPI, SCI, UART
• Digital Ic Case Style: PQFP
• Rohs Compliant: Yes
• Data Ram Size: 2 KB
• Number Of Programmable I/os: 15
• Number Of Timers: 16
• Cpu Family: 68K/M683xx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 20MHz
• Program Memory Size: Not Required
• Total Internal Ram Size: 2KB
• # I/os (max): 15
• Number Of Timers - General Purpose: 16
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 132
• Package Type: PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

7.6.1 System Configuration Registers
7.6.1.1 Prescaler Control for TCR1
7.6.1.2 Prescaler Control for TCR2
7-12
The TPU configuration control registers, TPUMCR and TICR, determine the value of
the prescaler, perform emulation control, specify whether the external TCR2 pin func-
tions as a clock source or as gate of the DIV8 clock for TCR2, and determine interrupt
request level and interrupt vector number assignment. Refer to APPENDIX D REGIS-
TER SUMMARY for more information about TPUMCR and TICR.
Timer control register one (TCR1) is clocked from the output of a prescaler. Two fields
in the TPUMCR control TCR1. The prescaler's input is the internal TPU system clock
divided by either 4 or 32, depending on the value of the PSCK (prescaler clock) bit.
The prescaler divides this input by 1, 2, 4, or 8, depending on the value of TCR1P (tim-
er count register 1 prescaler control). Channels using TCR1 have the capability to re-
solve down to the TPU system clock divided by 4. Refer to Figure 7-2 and Table 7-1.
Timer control register two (TCR2), like TCR1, is clocked from the output of a prescaler.
The T2CG (TCR2 clock/gate control) bit in TPUMCR determines whether the external
TCR2 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
7-3.
SYSTEM
TCR1 Prescaler
CLOCK
00
01
10
11
32
Divide
4
By
Freescale Semiconductor, Inc.
1
2
4
8
For More Information On This Product,
Figure 7-2 TCR1 Prescaler Control
DIV32 CLOCK
Table 7-1 TCR1 Prescaler Control
DIV4 CLOCK
Go to: www.freescale.com
Number of
TIME PROCESSOR UNIT
Clocks
128
256
32
64
0 – DIV32
1 – DIV4
PSCK
MUX
PSCK = 0
16 MHz
Rate at
16 ms
2 ms
4 ms
8 ms
PRESCALER
00 1
01 2
10 4
11 8
TCR1
Number of
Clocks
16
32
4
8
PSCK = 1
0
USER’S MANUAL
TCR1
PRESCALER CTL BLOCK 1
16 MHz
Rate at
250 ns
500 ns
1 ms
2 ms
MC68332
15