MC68HC705JP7CDW Freescale Semiconductor, MC68HC705JP7CDW Datasheet - Page 64

• Manufacturer Part Number: MC68HC705JP7CDW
• Description: IC MCU 8BIT 28-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705JP7CDW

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SIO
• Peripherals: POR, Temp Sensor, WDT
• Number Of I /o: 22
• Program Memory Size: 6KB (6K x 8)
• Program Memory Type: OTP
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Parallel Input/Output
7.3.8 PB6/SDI Logic
The PB6/SDI pin can be used as a simple I/O port pin or be controlled by the SIOP serial interface as
shown in
When using the PB6/SDI pin, these interactions must be noted:
64
1. If the SIOP function is required, then the SPE bit in the SCR must be set. This causes the PB6/SDI
2. If the SIOP function is in control of the PB6/SDI pin, the DDRB6 and PB6 data register bits are still
3. If the SIOP function is terminated by clearing the SPE bit in the SCR, then the last conditions stored
4. If the PB6/SDI pin is to be a digital input, then both the SPE bit in the SCR and the DDRB6 bit must
5. If the PB6/SDI pin is to be a digital output, then the SPE bit in the SCR must be cleared and the
pin buffer to be disabled to allow the PB6/SDI pin to act as an input that feeds the serial data input
(SDI) of the SIOP. The pulldown device is disabled in this case.
accessible to the CPU and can be altered or read without affecting the SIOP functionality.
However, if the DDRB6 bit is cleared, reading the PB6 data register will return the current state of
the PB6/SDI pin.
in the DDRB6, PDIB6, and PB6 register bits will then control the PB6/SDI pin.
be cleared. Depending on the external application, the pulldown device may also be disabled by
setting the PDIB6 pulldown inhibit bit.
DDRB6 bit must be set. The pulldown device will be disabled in this case.
Figure
WRITE $0005
WRITE $0001
WRITE $0011
RESET
READ $0005
READ $0001
7-11. The operations of PB6/SDI pin are summarized in
MC68HC705JJ7 • MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
SERIAL DATA IN (SDI)
SERIAL ENABLE (SPE)
R
R
PORT B DATA
Figure 7-11. PB6/SDI Pin I/O Circuit
REGISTER
DATA DIRECTION
BIT PB6
REGISTER B
REGISTER B
PULLDOWN
BIT DDRB6
BIT PDIB6
MASK OPTION REG. ($1FF1)
Table
7-3.
Freescale Semiconductor
PULLDOWN
DEVICE
PB6
SDI