HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 142

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HD6475328-CP10

Manufacturer Part Number
HD6475328-CP10
Description
original Hitachi CMOS microcomputer unit (MCU)
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
Table 6-6 Number of States before Interrupt Service
No. Reason for Wait
1
2
3
m: Number of wait states inserted in external memory access
6.4 Procedure for Using the DTC
A program that uses the DTC to transfer data must do the following:
1. Set the appropriate DTMR, DTSR, DTDR, and DTCR register information in the memory
2. Set the data transfer enable bit of the pertinent interrupt to “1,” and set the priority of the
3. Set the interrupt enable bit in the control register for the interrupt source. (For IRQ
Following these preparations, the DTC will be started each time the interrupt occurs. When the
number of bytes or words designated by the DTCR value have been transferred, after transferring
the last byte or word, the DTC generates a CPU interrupt.
The user-coded interrupt-handling routine must take action to prepare for or disable further DTC
data transfer: by readjusting the data transfer count, for example, or clearing the interrupt enable
bit. If no action is taken, the next interrupt of the same type will start the DTC with an initial data
transfer count of 65,536.
location indicated in the DTC vector table.
interrupt source (in the interrupt priority register) and the interrupt mask level (in the CPU
status register) so that the interrupt can be accepted.
the control register is the port 1 control register, P1CR.)
Interrupt priority decision and comparison with
mask level in CPU status register
Maximum number of
states to completion
of current instruction
Saving of PC and SR
or PC, CP, and SR
and instruction prefetch Stack is in external memory 28 + 6m
Instruction is in on-chip
memory
Instruction is in external
memory
Stack is in on-chip RAM
124
Minimum Mode
2 states
38
(LDM instruction specifying all registers)
74 + 16m
(LDM instruction specifying all registers)
16
Number of States
Maximum Mode
21
41 + 10m
0
and IRQ
1
,

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