Fujitsu FR60 Hardware Manual page 256

CHAPTER 5 I/O PORT
■ Initial Values and Functions of the Port Function Registers (PFRs)
Table 5.2-1 lists the initial values and functions of the port function registers (PFRs).
When the registers are used in single-chip mode, the external bus functions of PFR6, 8, 9, A, B1, B2, and C
cannot be used. Do not rewrite these registers. In addition, in single-chip mode, external bus function
output is disabled for the functions (A23-A16, WR1, SYSCLK, and CS3 -CS0) that result from the initial
values set to "1" in PFR6, 8, 9, and A. (Use these registers as general-purpose ports.)
Table 5.2-1 Initial Values and Functions of the Port Function Registers (PFRs) (1 / 7)
Register name
PFR6(A16E to A23E)
[P60/A16 to P67/A23]
P65/A21E,P66/A22E,P67/
A23E*
PFR8(BRQE)
[P81/IN1/BGRNT,P82/IN2/
BRQ]
PFR8(WR1XE)
[P85/IN3/WR1]
PFR9(SYSE)
[P90/SYSCLK]
PFR9(MCKE)
[P92/MCLK] *
238
Bit name
A16E
A17E
A18E
A19E
A20E
*
A21E
*
A22E
*
A23E
BRQE
WR1XE
SYSE
MCKE*
Bit
0 General-purpose port *
1 Address output (initial value)
0 General-purpose port *
1 Address output (initial value)
0 General-purpose port *
1 Address output (initial value)
0 General-purpose port *
1 Address output (initial value)
0 General-purpose port *
1 Address output (initial value)
0 General-purpose port *
1 Address output (initial value)
0 General-purpose port *
1 Address output (initial value) *
0 General-purpose port *
1 Address output (initial value) *
0 General-purpose port (initial value) *
BRQ, BGRNT
1
0 General-purpose port
1 WR1/ULB output (initial value)
0 General-purpose port
1 Set "1" when using SYSCLK output (initial value).
0 General-purpose port (initial value) *
1 Set "1" when using memory clock output. *
Function