Datasheet

Section 8 I/O Ports
Rev.7.00 Dec. 24, 2008 Page 264 of 698
REJ09B0074-0700
8.11.4 Clock Output Control Register (OUTCR)
OUTCR specifies the clock frequency output from the PF7 pin.
Bit Bit Name Initial Value R/W Description
7 to
3
⎯ Undefined ⎯ Reserved
The write value should always be 0.
2
1
0
PF7OUT2
PF7OUT1
PF7OUT0
0
0
0
R/W
R/W
R/W
PF7 Pin Output Select 2 to 0
000: Main oscillation clock
001: Outputs 1/2 of main oscillation clock
010: Outputs 1/3 of main oscillation clock
011: Outputs 1/4 of main oscillation clock
1xx: Reserved
This function is not supported by the E6000 emulator.
φ in section 22, Electrical Characteristics is in the case
when PF7OUT2 to PF7OUT0 = 000.
8.11.5 Pin Functions
Pin Functions of H8S/2218 Group
The port F is an 8-bit I/O port. Port F pins also function as external interrupt input (IRQ2, IRQ3)
pins, bus control signal I/O pins, and system clock output (φ) pins. The correspondence between
the register specification and the pin functions is shown below.
Table 8.81 PF7 Pin Function
PF7DDR 0 1
PF7OUT2 to PF7OUT0 ⎯ B'000 B'001 B'010 B'011
Pin Function PF7 input pin φ output pin φ/2 output pin φ/3 output pin φ/4 output pin
Table 8.82 PF6 Pin Function
Operating Mode Modes 4 to 6 Mode 7
PF6DDR ⎯ 0 1
Pin Function AS output pin PF6 input pin PF6 output pin