COP8AME9 datasheet(13/102 Pages) TI1

13 / 102 page

COP8AME9, COP8ANE9

www.ti.com

SNOS930F – MARCH 2001 – REVISED MARCH 2013

Port G is an 8-bit port. Pin G0, G2–G5 are bi-directional I/O ports. Pin G6 is always a general purpose Hi-Z input.

All pins have Schmitt Triggers on their inputs. Pin G1 serves as the dedicated WATCHDOG output with weak

pull-up if the WATCHDOG feature is selected by the Option register. The pin is a general purpose I/O if

WATCHDOG feature is not selected. If WATCHDOG feature is selected, bit 1 of the Port G configuration and

data register does not have any effect on Pin G1 setup.

G7 serves as the dedicated output pin for the CKO clock output.

There are two registers associated with the G Port, a data register and a configuration register. Therefore, each

of the 6 I/O bits (G0 - G5) can be individually configured under software control.

Since G6 is an input only pin and G7 is the dedicated CKO clock output pin, the associated bits in the data and

configuration registers for G6 and G7 are used for special purpose functions as outlined below. Reading the G6

and G7 data bits will return zeros.

The chip is placed in the HALT mode by writing a "1" to bit 7 of the Port G Data register. Similarly the chip will be

placed in the IDLE mode by writing a "1" to bit 6 of the Port G Data Register.

Writing a “1” to bit 6 of the Port G Configuration Register enables the MICROWIRE/PLUS to operate with the

alternate phase of the SK clock.

Config. Reg.

Data Reg.

Not Used

HALT

Alternate SK

IDLE

Port G has the following alternate features:

CKO Oscillator dedicated output

SI (MICROWIRE/PLUS Serial Data Input)

SK (MICROWIRE/PLUS Serial Clock)

SO (MICROWIRE/PLUS Serial Data Output)

T1A (Timer T1 I/O)

T1B (Timer T1 Capture Input)

WDOUT WATCHDOG and/or Clock Monitor if WATCHDOG enabled, otherwise it is a general purpose I/O

INTR (External Interrupt Input)

G0 through G3 are also used for In-System Emulation.

Port L is an 8-bit I/O port. All L-pins have Schmitt triggers on the inputs.

Port L supports the Multi-Input Wake-Up feature on all eight pins. Port L has the following alternate pin functions:

Multi-Input Wake-up or T3B (Timer T3B Input)

Multi-Input Wake-up or T3A (Timer T3A Input/Output)

Multi-Input Wake-up or T2B (Timer T2B Input)

Multi-Input Wake-up or T2A (Timer T2A Input/Output)

Multi-Input Wake-up and/or RDX (USART Receive)

Multi-Input Wake-up or TDX (USART Transmit)

Multi-Input Wake-up and/or CKX (USART Clock) (Low Speed Oscillator Output)

Multi-Input Wake-up (Low Speed Oscillator Input)

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