Microprocessor Interface Signals - NEC mPD98410 User Manual

2.4.1 Microprocessor interface signals

The µ PD98410 supports the following two types of microprocessor interfaces:
(1) 32-bit address/data multiplexed synchronous bus
(2) 16-bit address/data separated asynchronous bus
The functions of some pins differ depending on the mode used.
Symbol
HSEL 340
IOCS_B 94
MCS_B 221
INT 451
Symbol
HCLK 220
AD31 - AD0 223, 342, 343, 224, 225, 344, 227, 454,
345, 228, 455, 229, 346, 104, 456, 230,
457, 105, 348, 231, 458, 106, 349, 232,
350, 107, 460, 351, 108, 234, 109, 461
R/W_B 222
UWE_B 452
RDY_B 95
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CHAPTER 2 PIN FUNCTIONS
Table 2-5. Microprocessor Interface
Pin No.
Table 2-6. 32-Bit Multiplexed Synchronous Interface
Pin No.
I/O
I Microprocessor interface select signal.
The 32-bit multiplexed synchronous bus is selected if
HSEL is low at hardware reset, and the 16-bit separated
asynchronous bus is selected if HSEL is high.
I I/O chip select signal
I Memory chip select signal
O Interrupt request signal
I/O
I Microprocessor bus clock (8 M to 33 MHz)
I/O Address/data bus
I Read/write select signal
I High-order word enable signal
O Ready signal (3-state buffer)
Function
Function