Μ Pd754244 I/O Map - NEC PD754144 User Manual

CHAPTER 3 FEATURES OF ARCHITECTURE AND MEMORY MAP
Hardware name (symbol)
Address
b3 b2
F80H Stack pointer (SP)
Register bank selection register (RBS)
F82H
................................................................................
Bank selection register (BS)
................................................................................
F83H
Memory bank selection register (MBS)
F84H Stack bank selection register (SBS)
F85H Basic interval timer mode register (BTM)
F86H Basic interval timer (BT)
F88H Modulo register for setting timer counter 2
high-level period (TMOD2H)
F8AH Unmounted
Note 2
F8BH WDTM –
F8CH Unmounted
to
F8FH
Notes 1. Manipulation is possible separately with RBS and MBS in 4-bit manipulation. Manipulation is possible
with BS in 8-bit manipulation. Write data into MBS and RBS with the SEL MBn (n = 0, 4 or 15) and
SEL RBn (n = 0-3) instructions.
2. WDTM: Watchdog timer enable flag (W); Once set, cannot be cleared by an instruction.
52
Figure 3-7. µ PD754244 I/O Map (1/8)
Number of bits that
can be manipulated
R/W
b1 b0 1-bit
R/W –
–
R
–
R/W –
W
R –
R/W –
– – W
User's Manual U10676EJ3V0UM
Bit
manipulation
addressing
4-bit 8-bit
– – Bit 0 is fixed to 0.
–
– –
– mem.bit Bit manipulation can be performed only on bit 3.
– –
– –
– – mem.bit
Remarks
Note 1