HD64F2638F20J Datasheet, PDF (781/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 19 Motor Control PWM Timer
19.3 Bus Master Interface
19.3.1 16-Bit Data Registers
PWCYR1/2, PWBFR1A/C/E/G, and PWBFR2A/B/C/D are 16-bit registers. These registers are
linked to the bus master by a 16-bit data bus, and can be read or written in 16-bit units. They
cannot be read by 8-bit access; 16-bit access must always be used.
Internal data bus
H
Bus
master L
Bus
interface
Module
data bus
PWCYR1
Figure 19-8 16-Bit Register Access Operation (Bus Master ↔ PWCYR1 (16 Bits))
19.3.2 8-Bit Data Registers
PWCR1/2, PWOCR1/2, and PWPR1/2 are 8-bit registers that can be read and written to in 8-bit
units. These registers are linked to the bus master by a 16-bit data bus, and can be read or written
by 16-bit access; in this case, the lower 8 bits will always be read as H'FF.
Internal data bus
H
Bus
master L
Bus
interface
Module
data bus
PWCR1
Figure 19-9 8-Bit Register Access Operation (Bus Master ↔ PWCR1 (Upper 8 Bits))
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 731 of 1458