HMS87C5216 Datasheet, PDF (50/76 Pages) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

HMS87C5216
13. INTERRUPTS
The GMS81C5016/24/32 interrupt circuits consist of Interrupt
Mode Register (MOD), Interrupt enable register (IENH, IENL),
Interrupt request flags of IRQH, IRQL, Priority circuit and Mas-
ter enable flag ("I" flag of PSW). 8 interrupt sources are provided.
The configuration of interrupt circuit is shown in Figure 13-1.
The GMS81C5016/24/32 contains 8 interrupt sources; 3 exter-
nals and 5 internals. Nested interrupt services with priority con-
trol is also possible. Software interrupt is non-maskable interrupt,
the others are all maskable interrupts.
- 8 interrupt source (2Ext, 3Timer, BIT, WDT and Key Scan)
- 8 interrupt vector
- Nested interrupt control is possible
- Programmable interrupt mode
- Hardware accept mode
- Software selection accept mode
- Read and write of interrupt request flag are possible.
- In interrupt accept, request flag is automatically cleared.
0
IENL
-----
Internal Data Bus
7
0
-
-
IENH
-
7
0
IMOD
7
--
KSCN KSCNR
INT1 INT1R
INT2 INT2R
IFT0 T0R
IFT1 T1R
IFT2 T2R
IFWDT WDTR
IFBIT
BITR
IRQ
Figure 13-1 Block Diagram of Interrupt
PRIORITY
CONTROL
INT.
VECTOR
ADDR.
BRK
Standby Mode Release
13.1 Interrupt priority and sources.
Each interrupt vector is independent and has its own priority.
Software interrupt (BRK) is also available. Interrupt source clas-
sification is shown in Table 13-1.
SEP. 2004 Ver 1.01