HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 325
HD6475328-CP10
Manufacturer Part Number
HD6475328-CP10
Description
original Hitachi CMOS microcomputer unit (MCU)
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6475328-CP10.pdf
(459 pages)
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Section 19 E Clock Interface
19.1 Overview
For interfacing to E clock based peripheral devices, the H8/532 can generate an E clock output.
Special instructions (MOVTPE, MOVFPE) perform data transfers synchronized with the E clock.
The E clock is created by dividing the system clock (ø) by 8. The E clock is output at the P1
pin
1
when the P1
DDR bit in the port 1 data direction register (P1DDR) is set to 1.
1
When the CPU executes an instruction that synchronizes with the E clock, the address is output on
the address bus as usual, but the data bus and the R/W, DS, RD, and WR signal lines do not
become active until the falling edge of the E clock is detected. The length of the access cycle for
an instruction synchronized with the E clock is accordingly variable. Figures 19-1 and 19-2 show
the timing in the cases of maximum and minimum synchronization delay.
The wait state controller (WSC) does not insert any wait states (Tw) during the execution of an
instruction synchronized with the E clock.
315
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