Motorola MVME147 Installation And Use Manual page 51

Introduction
This chapter provides the information needed to program the
Peripheral Channel Controller (PCC) and the VMEchip.
Programming the Peripheral Channel
Controller
These sections contain a description of the PCC internal registers
and the bit assignments within each register. All registers may be
written or read as bytes. Some restrictions apply to bit set and clear
instructions and they should not be used, where indicated. An
overall view of the PCC is shown in Table 4-1.
Note In the tables for the 8-bit PCC register definitions that
follow, the characters in the bottom line define the
operations possible on the register bits, as follows:
R This bit is a read-only status bit.
R/W This bit is readable and writable.
C Writing a 1 to this bit clears it. This bit reads 0.
R/C This bit is readable. Writing a 1 to this bit clears it.
4Programming
4
4-1