RDC
®
RISC DSP Controller
R8810LV
RDC Semiconductor Co.
Rev:1.1
Subject to change without notice
11
programmed by software.
For
0
ONCE
feature, see UCS /
1
ONCE description. This pin
incorporates weakly pull-up register.
59
60
6
PCS /A2/PIO2
5
PCS /A1/PIO3
Output/Input
Peripheral chip selects/latched address bit. For PCS feature,
these pins act low when the microcontroller accesses the fifth
or sixth region of the peripheral memory (I/O or memory
space). The base address of PCS is programmable. These pins
assert with the AD address bus and are not float during bus
hold.
For latched address bit feature. These pins output the latched
address A2, A1 when cleared the EX bit in the MCS and PCS
auxiliary register. The A2, A1 retains previous latched data
during bus hold.
62
63
65
66
3
PCS /PIO19
2
PCS /PIO18
1
PCS /PIO17
0
PCS /PIO16
Output/Input
Peripheral chip selects. These pins act low when the
microcontroller accesses the defined memory area of the
peripheral memory block (I/O or memory address). For I/O
accessed, the base address can be programmed in the region
00000h to 0FFFFh.
For memory address access, the base address can be located in
the 1M byte memory address region. These pins assert with the
multiplexed AD address bus and are not float during bus hold.
Interrupt Control Unit Interface
47
NMI
Input
Nonmaskable Interrupt. The NMI is the highest priority
hardware interrupt and is nonmaskable. When this pin is
asserted (NMI transition from low to high), the microcontroller
always transfers the address bus to the location specified by the
nonmaskable interrupt vector in the microcontroller interrupt
vector table. The NMI pin must be asserted for at least one
CLKOUTA period to guarantee that the interrupt is recognized.
52
INT4/PIO30
Input/Output
Maskable interrupt request 4. Act high. This pin indicates that
an interrupt request has occurred. The microcontroller will
jump to the INT4 address vector to execute the service routine
if the INT4 is enable. The interrupt input can be configured to
be either edge- or level-triggered. The requesting device must
holt the INT4 until the request is acknowledged to guarantee
interrupt recognition.
53
INT3/
1
INTA /IRQ Input/Output
Maskable interrupt request 3/interrupt acknowledge 1/slave
interrupt request. For INT3 feature, except the difference
interrupt line and interrupt address vector, the function of INT3
is the same as INT4.
For
1
INTA feature, in cascade mode or special fully-nested
mode, this pin corresponds the INT1.
For IRQ feature, when the microcontroller is as a slave device,
this pin issues an interrupt request to the master interrupt
controller.
54
INT2/
0
INTA
/PIO31 Input/Output
Maskable interrupt request 2/interrupt acknowledge 0. For
INT2 feature, except the difference interrupt line and interrupt
address vector, the function of INT2 is the same as INT4.
For
0
INTA
feature, in cascade mode or special fully-nested
mode, this pin corresponds the INT0.
55
INT1/ SELECT
Input/Output
Maskable interrupt request 1/slave select. For INT1 feature,
except the difference interrupt line and interrupt address vector,
the function of INT1 is the same as INT4.