ST7260E1 STMicroelectronics, ST7260E1 Datasheet - Page 37

• Manufacturer Part Number: ST7260E1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 8K FLASH/ROM AND SERIAL COMMUNICATION INTERFACE (SCI)
• Manufacturer: STMicroelectronics

Specifications of ST7260E1

• 4 Or 8 Kbytes Program Memory: high density Flash (HDFlash), or FastROM with readout and write protection

ST7260xx
Note:
Note:
Caution:
10.2.1
1
2
In this mode, writing “0” or “1” to the DR register applies this digital value to the I/O pin
through the latch. Therefore, the previously saved value is restored when the DR register is
read.
The interrupt function is disabled in this mode.
Alternate function
When an on-chip peripheral is configured to use a pin, the alternate function is automatically
selected. This alternate function takes priority over standard I/O programming. When the
signal is coming from an on-chip peripheral, the I/O pin is automatically configured in output
mode (push-pull or open drain according to the peripheral).
When the signal is going to an on-chip peripheral, the I/O pin has to be configured in input
mode. In this case, the pin’s state is also digitally readable by addressing the DR register.
Input pull-up configuration can cause an unexpected value at the input of the alternate
peripheral input.
When the on-chip peripheral uses a pin as input and output, this pin must be configured as
an input (DDR = 0).
The alternate function must not be activated as long as the pin is configured as an input with
interrupt in order to avoid generating spurious interrupts.
Port A
Table 14.
1. Reset state
2. Not available on SO24
Port A
PA6
PA0
PA3
PA4
PA5
PA7
(2)
Port A0, A3, A4, A5, A6, A7 description
with pull-up
with pull-up
with pull-up
with pull-up
with pull-up
with pull-up
Input
(1)
I/O
push-pull
push-pull
push-pull
push-pull
push-pull
push-pull
Output
IT1 Schmitt triggered
IT2 Schmitt triggered
IT3 Schmitt triggered
IT4 Schmitt triggered
MCO (Main Clock
Timer EXTCLK
Timer OCMP1
Timer OCMP2
Timer ICAP1
Timer ICAP2
Output)
Signal
input
input
input
input
Alternate function
CC0 = 1 (Timer CR2)
MCO = 1 (MISCR)
IT1E = 1 (ITIFRE)
IT2E = 1 (ITIFRE)
IT3E = 1 (ITIFRE)
IT4E = 1 (ITIFRE)
Condition
OC1E = 1
OC2E = 1
CC1 =1
I/O ports
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