MC68HC908SR12CFA Freescale Semiconductor, MC68HC908SR12CFA Datasheet - Page 324

• 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

Input/Output (I/O) Ports
18.4.1 Port B Data Register (PTB)
Data Sheet
324
Alternative Functions:
Address:
The port B data register contains a data latch for each of the eight port B
pins.
PTB[6:0] — Port B Data Bits
SDA0, SCL0, SDA1, SCL1 — MMIIC Channels 1 and 2
TxD, RxD — SCI Data I/O Pins
Reset:
Read:
Write:
These read/write bits are software programmable. Data direction of
each port B pin is under the control of the corresponding bit in data
direction register B. Reset has no effect on port B data.
SDAx and SCLx are the data and clock lines for the MMIIC module.
The multi-master enable bit, MMEN, and the MMIIC channel select
bit, SDASCL1, in the MMIIC control register 1 determine whether the
PTB0/SDA0, PTB1/SCL0, PTB2/SDA1/TxD, and PTB3/SCL1/RxD
pins are MMIIC I/O pins or general purpose I/O pins. See
Multi-Master IIC Interface
The TxD and RxD pins are the transmit data output and receive data
input for the SCI module. The enable SCI bit, ENSCI, in the SCI
control register 1 enables the PTB2/SDA1/TxD and PTB3/SCL1/RxD
pins as SCI TxD and RxD pins and overrides any control from the port
I/O or MMIIC logic. See
Interface
$0001
Bit 7
Figure 18-6. Port B Data Register (PTB)
0
(SCI).
Input/Output (I/O) Ports
PTB6
IRQ2
6
T2CH1
PTB5
5
Section 16. Serial Communications
(MMIIC).
MC68HC908SR12•MC68HC08SR12 — Rev. 5.0
Unaffected by reset
T2CH0
PTB4
4
These four pins are open-drain when configured as
output pins. Pullup resistors must be connected
when configured as outputs.
PTB3
SCL1
RxD
3
PTB2
SDA1
TxD
Freescale Semiconductor
2
PTB1
SCL0
1
Section 17.
SDA0
PTB0
Bit 0