Figure 3-16. Digin Output Register - Brainboxes AD-593 User Manual

AD1200 Reference
TTL output logic level high is 2.4 ~5.0 Volts.
___________________________ _ The Digital Input Port Register.
The Digital Input Port Register, DIGIN, is an 8 bit read
only register. The bit values read represent the logic levels
present on the 8 TTL input lines. Thus lines that are high cause
the corresponding DIGIN bit to read high, those lines that are
low cause the corresponding DIGIN bit to read low. If on
reading the DIGIN register a value of 0FFhex is obtained then
all the TTL input lines where true. A reading of 00hex means
that all lines were low. A reading of 01hex means that only
DIGIN line 0 was high, all the rest are low.
TTL output logic level low is 0.0 ~0.8 Volts.
TTL output logic level high is 2.4 ~5.0 Volts.
________________________________

Figure 3-16. DIGIN Output Register.

DIGIN Digital Input Port Register.
BIT 7
021E DIGIN
Hex 7
Read
The Timer & Extended Mode Register. _________________________________ _
The TIMEREX Register, is an 8 bit read/write register. It
is used to select the pacer clock frequency and to select
Extended Mode operation on the AD1200 card.
Page 66
BIT 6 BIT 5
DIGIN DIGIN
6 5
Read Read
BIT 4 BIT 3
DIGIN DIGIN
4 3
Read Read
Register Map
_________ _ Read Only
BIT 2 BIT 1
DIGIN DIGIN
2 1
Read Read
__________ _ Read/ Write
Chapter 3
BIT 0
DIGIN
0
Read