MC68HC908SR12CFA Freescale Semiconductor, MC68HC908SR12CFA Datasheet - Page 206

• Manufacturer Part Number: MC68HC908SR12CFA
• Description: MICROCONTROLLER 48 PIN
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908SR12CFA

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SCI
• Peripherals: LVD, POR, PWM, Temp Sensor
• Number Of I /o: 31
• Program Memory Size: 12KB (12K 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 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Other names: Q1145673

Timebase Module (TBM)
12.4 Functional Description
Data Sheet
206
(See
From OSC module
OSCCLK
Section 7. Oscillator
÷ 2
÷ 2
÷ 2
÷ 2
(OSC).)
÷ 2
÷ 2
This module can generate a periodic interrupt by dividing the oscillator
clock frequency, OSCCLK. The counter is initialized to all 0s when
TBON bit is cleared. The counter, shown in
when the TBON bit is set. When the counter overflows at the tap
selected by TBR2:TBR0, the TBIF bit gets set. If the TBIE bit is set, an
interrupt request is sent to the CPU. The TBIF flag is cleared by writing
a 1 to the TACK bit. The first time the TBIF flag is set after enabling the
timebase module, the interrupt is generated at approximately half of the
overflow period. Subsequent events occur at the exact period.
The reference clock OSCCLK is derived from the oscillator module, see
7.3.2 TBM Reference Clock
÷ 2
Figure 12-1. Timebase Block Diagram
÷ 8
÷ 32768
÷ 2
÷ 2
÷ 16
÷ 65536
÷ 2
Timebase Module (TBM)
÷ 2
÷ 32
÷ 131072
÷ 2
÷ 2
÷ 64
÷ 2
÷ 262144
Selection.
÷ 2
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
÷ 2
÷ 2
SEL
Figure
÷ 2
÷ 2048
Freescale Semiconductor
12-1, starts counting
R
TBIF
TBMINT
TBON
TBIE