µ
PD75512
31
Address bit
Symbol
L register
3
2
1
0
3
2
1
0
3
2
1
0
3
2
1
0
L = F
L = C L = B
L = 8 L = 7
L = 4 L = 3
L = 0
BSB3
BSB2
BSB1
BSB0
DECS L
INCS L
FC3H
FC2H
FC1H
FC0H
6.10
BIT SEQUENTIAL BUFFER ..... 16 BITS
The bit sequential buffer is a data memory specifically provided for bit manipulation. With this buffer,
addresses and bit specifications can be sequentially up-dated in bit manipulation operation. Therefore, this
buffer is very useful for processing long data in bit units.
Remarks: For the pmem.@L addressing, the specification bit is shifted according to the L register.
Fig. 6-11 Bit Sequential Buffer Format
7. INTERRUPT FUNCTIONS
The
µ
PD75512 has 7 different interrupt sources and multiplexed interrupt with priority order.
In addition to that, the
µ
PD75512 is also provided with two types of test sources, of which INT2 has two types
of edge detection testable inputs.
The interrupt control circuit of the
µ
PD75512 has these functions:
•
Hardware controlled vector interrupt function which can control whether or not to accept an interrupt by
using the interrupt flag (IExxx) and interrupt master enable flag (IME).
•
The interrupt start address can be arbitrarily set.
•
Interrupt request flag (IRQxxx) test function (an interrupt generation can be confirmed by means of
software).
•
Standby mode release (Interrupts to be released can be selected by the interrupt enable flag).