TMS370 datasheet(40/63 Pages) TI

40 / 63 page

TMS370CxCx

8-BIT MICROCONTROLLER

SPNS040B – NOVEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

analog-to-digital converter 2 module (continued)

Bits 0–3

PORT E DATA AN0–AN3 (Analog port E data in)

The ADIN register shows the data present at the pins configured for general-purpose input instead

of ADC2 channels. A bit is configured as general-purpose input if the corresponding bit of the port

enable register is a 1. Pins configured as ADC2 channels are read as 0s. Writing to this address

has no effect.

Bits 4–7

Reserved (read data is indeterminate)

Table 34. AN0 – AN3 Port E0 –E3 Data Input-Enable Register (ADENA)

Bit #

P07E

—

INPUT

ENA 3

INPUT

ENA 2

INPUT

ENA 1

INPUT

ENA 0

RW – 0

RW– 0

R = read, W = write, –

n = value of the bit after the register is reset

Bits 0–3

INPUT ENA 0–3 (Analog port E input enable)

The ADENA register individually configures the pins AN0–AN3 as either analog-input channels

or as general-purpose input pins.

0 = The pin becomes an analog-input channel for the ADC2. When the bit is 0, the

corresponding bit in the ADIN register reads 0.

1 = Enables the pin as a general-purpose input pin and its digital value can be read from the

corresponding bit in the ADIN register.

Bits 4–7

Reserved (read data is indeterminate)

Table 35. Analog Interrupt Priority / Conversion Rate Register (ADPRI)

Bit #

P07F

STEST

PRIORITY

ESPEN

—

RP – 0

RW – 0

RW– 0

R = read, W = write, P = privileged write, –

n = value of the bit after the register is reset

Bits 0–4

Reserved (read data is indeterminate)

Bit 5

AD ESPEN (emulator suspend enable)

Normally this bit has no effect. However, when using the XDS emulator to debug a program, this

bit determines what happens to the ADC2 when the program is suspended by an action such as

a hardware or software breakpoint.

0 = When the emulator is suspended, the ADC2 continues to run until the conversion is

complete

1 = When the emulator is suspended, the ADC2 is frozen so that its state can be examined at

the point that the emulator was suspended. The conversion data is indeterminate upon

restart.

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