Rev. 1.00, 09/03, page 10 of 704
Type
Symbol
Pin No.
I/O
Name and Function
Bus control
WAIT
22
Input
Requests insertion of a wait state in the bus
cycle when accessing an external 3-state
address space.
RD
18
Output This pin is low when the external address space
is being read.
HWR
19
Output This pin is low when the external address space
is to be written to, and the upper half of the data
bus is enabled.
LWR
14
Output This pin is low when the external address space
is to be written to, and the lower half of the data
bus is enabled.
AS
20
Output This pin is low when address output on the
address bus is valid.
CS3
to
CS1
91, 15, 17 Output Chip select signals for areas 3 to 1.
AH
20
Output Address latch signal for address/data multiplex
bus.
NMI
27
Input
Nonmaskable interrupt request input pin
IRQ7
to
IRQ0
76
to
73
52 to 49
Interrupts
ExIRQ7
to
ExIRQ0
70 to 67
1 to 4
Input
These pins request a maskable interrupt.
Selectable to which pin of IRQn or ExIRQn to
input IRQ7 to IRQ0 interrupts.
ETRST
*
2
39
Input
ETMS 35 Input
ETDO 40 Output
ETDI 38 Input
On-chip
emulator
ETCK 36 Input
Interface pins for the on-chip emulator.
Reset by holding the
ETRST
pin to low when
activating the H-UDI. At this time, the
ETRST
pin
should be held low for 20 clocks of ETCK. For
details, see section 24, Electrical
Characteristics. Then, to activate the H-UDI, the
ETRST
pin should be set to 1 and desired
values should be set to the ETCK, ETMS, and
ETDI pins. When in the normal operation without
activating the H-UDI, the
ETRST
, ETCK, ETMS,
and ETDI pins should be set to 1 or high-
impedance. Since these pins are internally
pulled up, care should be taken in the standby
state.
PW7 to PW0 116, 117,
119, 124
8-bit PWM
timer (PWM)
ExPW7 to
ExPW0
97, 98,
48, 47,
76 to 73
Output Pulse output pins for the PWM timer.
Selectable from which pin of PWn or ExPWn to
output PW5 to PW0.
Summary of Contents for H8S/2437
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