S9S08SG8E2VTG Freescale Semiconductor, S9S08SG8E2VTG Datasheet - Page 82

• Manufacturer Part Number: S9S08SG8E2VTG
• Description: 8-bit Microcontrollers - MCU 9S08 UC W/ 8K 0.25UM SGF
• Manufacturer: Freescale Semiconductor

Specifications of S9S08SG8E2VTG

• Rohs: yes
• Core: S08
• Processor Series: MC9S08SG8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 40 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 8 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 5.5 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: TSSOP-16
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 12
• Interface Type: SCI, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 16
• Number Of Timers: 2
• Program Memory Type: Flash
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

Chapter 6 Parallel Input/Output Control
6.4
Port A[3:0] and port B[3:0] pins can be configured as external interrupt inputs and as an external means
of waking the MCU from stop3 or wait low-power modes.
The block diagram for the pin interrupts is shown
Writing to the PTxPSn bits in the port interrupt pin enable register (PTxPS) independently enables or
disables each port pin interrupt. Each port can be configured as edge sensitive or edge and level sensitive
based on the PTxMOD bit in the port interrupt status and control register (PTxSC). Edge sensitivity can be
software programmed to be either falling or rising; the level can be either low or high. The polarity of the
edge or edge and level sensitivity is selected using the PTxESn bits in the port interrupt edge select register
(PTxES).
Synchronous logic is used to detect edges. Prior to detecting an edge, enabled pin interrupt inputs must be
at the deasserted logic level. A falling edge is detected when an enabled port input signal is seen as a logic
1 (the deasserted level) during one bus cycle and then a logic 0 (the asserted level) during the next cycle.
A rising edge is detected when the input signal is seen as a logic 0 during one bus cycle and then a logic 1
during the next cycle.
6.4.1
A valid edge on an enabled pin interrupt will set PTxIF in PTxSC. If PTxIE in PTxSC is set, an interrupt
request will be presented to the CPU. Clearing of PTxIF is accomplished by writing a 1 to PTxACK in
PTxSC.
6.4.2
A valid edge or level on an enabled pin interrupt will set PTxIF in PTxSC. If PTxIE in PTxSC is set, an
interrupt request will be presented to the CPU. Clearing of PTxIF is accomplished by writing a 1 to
PTxACK in PTxSC provided all enabled pin interrupt inputs are at their deasserted levels. PTxIF will
remain set if any enabled pin interrupt is asserted while attempting to clear by writing a 1 to PTxACK.
78
PIxn
PIxn
PTxES0
PTxESn
Pin Interrupts
0
0
1
1
S
S
Edge Only Sensitivity
Edge and Level Sensitivity
PTxPS0
PTxPSn
Figure 6-2. Pin Interrupt Block Diagram
MC9S08SG8 MCU Series Data Sheet, Rev. 7
PTxMOD
V
DD
D
Figure
CK
CLR
Q
6-2.
INTERRUPT FF
PORT
PTxACK
RESET
STOP
SYNCHRONIZER
STOP BYPASS
BUSCLK
PTxIE
Freescale Semiconductor
PTxIF
PTx
INTERRUPT
REQUEST