<ꢀ5ꢁꢀꢂꢃ<ꢀ.ꢁꢀꢂ
'PJCPEGFꢄ<ꢁꢀꢂꢄ/KETQRTQEGUUQT
ZiLOG
+ꢃ1ꢄ%10641.ꢄ4')+56'4
The I/O Control Register (+%4) allows relocation of the in-
ternal I/O addresses. +%4 also controls the enabling and dis-
abling of +15612 mode (Figure 83).
$KV
ꢊ
ꢁ
ꢏ
ꢎ
ꢍ
ꢂ
ꢄ
ꢀ
+1#ꢊ
+1#ꢁ
+1562
4ꢌ9
4ꢌ9
4ꢌ9
(KIWTG ꢀꢋꢆ +ꢃ1ꢄ%QPVTQNꢄ4GIKUVGTꢄꢌ+%4ꢅꢄ+ꢃ1ꢄ#FFTGUUꢄꢒꢄꢋ(*ꢍ
+1#ꢐꢎꢄꢈꢅꢄ+ꢃ1ꢄ#FFTGUUꢄ4GNQECVKQPꢄꢌ$KVUꢄꢐꢎꢈꢍꢆꢄ+1#ꢊ and
+1#ꢁ relocate internal I/O as indicated in Figure 84.
0QVGꢅ The high-order 8 bits of 16-bit internal I/O address are al-
ways 0. +1#ꢊ and +1#ꢁ are cleared toꢅ0ꢅduring 4'5'6
.
ꢀꢀ((*
+1#ꢊ +1#ꢁꢅꢐꢅꢄꢅꢄ
+1#ꢊ +1#ꢁꢅꢐꢅꢄꢅꢀ
+1#ꢊ +1#ꢁꢅꢐꢅꢀꢅꢄ
+1#ꢊ +1#ꢁꢅꢐꢅꢀꢅꢀ
ꢀꢀ%ꢀ*
ꢀꢀ$(*
ꢀꢀꢆꢀ*
ꢀꢀꢊ(*
ꢀꢀꢎꢀ*
ꢀꢀꢍ(*
ꢀꢀꢀꢀ*
(KIWTG ꢀꢉꢆ +ꢃ1ꢄ#FFTGUUꢄ4GNQECVKQP
+1562ꢅꢄ+15612ꢄ/QFGꢄꢌ$KVꢄꢑꢍꢆꢄꢄ+15612 mode is enabled
when +1562 isset to1. NormalI/Ooperationresumeswhen
+1562 is reprogrammed or 4'5'6 to 0.
ꢁꢆ
2ꢅ4ꢅ'ꢅ.ꢅ+ꢅ/ꢅ+ꢅ0ꢅ#ꢅ4ꢅ;
&5ꢀꢀꢁꢀꢀꢂꢃ</2ꢀꢂꢀꢀ
ZILOG [ ZILOG, INC. ]
