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184
Table 8.1
H8S/2138 Series Port Functions (cont)
Expanded Modes
Single-Chip Mode
Port
Description
Pins
Mode 1
Mode 2, Mode 3
(EXPE = 1)
Mode 2, Mode 3
(EXPE = 0)
Port 2
8-bit I/O port
Built-in MOS
input pull-ups
LED drive
capability
P27/A15/PW15/
CBLANK
P26/A14/PW14
P25/A13/PW13
P24/A12/PW12
P23/A11/PW11
P22/A10/PW10
P21/A9/PW9
P20/A8/PW8
Upper address
output
(A15 to A8)
When DDR = 0
(after reset): input
port or timer
connection output
(CBLANK)
When DDR = 1:
upper address
output (A15 to A8),
PWM timer output
(PW15 to PW8),
timer connection
output (CBLANK),
or output ports
(P27 to P24)
I/O port also functioning as
PWM timer output (PW15 to
PW8) and timer connection
output (CBLANK)
Port 3
8-bit I/O port
Built-in MOS
input pull-ups
LED drive
capability
P37 to P30/
HDB7 to HDB0/
D7 to D0
Data bus input/output (D7 to D0)
I/O port also functioning as
host interface data bus
input/output (HDB7 to
HDB0)
Port 4
8-bit I/O port P47/PWX1
P46/PWX0
P45/TMRI1/
HIRQ12/CSYNCI
P44/TMO1/
HIRQ1/HSYNCO
P43/TMCI1/
HIRQ11/HSYNCI
P42/TMRI0/
SCK2/SDA1
P41/TMO0/
RxD2/IrRxD
P40/TMCI0/
TxD2/IrTxD
I/O port also functioning as 14-bit
PWM timer output (PWX1, PWX0),
8-bit timer 0 and 1 input/output
(TMCI0, TMRI0, TMO0, TMCI1,
TMRI1, TMO1), timer connection
input/output (HSYNCO, CSYNCI,
HSYNCI), SCI2 input/output (TxD2,
RxD2, SCK2), IrDA interface
input/output (IrTxD, IrRxD), and I
2C
bus interface 1 (option) input/output
(SDA1)
I/O port also functioning as
14-bit PWM timer output
(PWX1, PWX0), 8-bit timer 0
and 1 input/
output (TMCI0, TMRI0,
TMO0, TMCI1, TMRI1,
TMO1), timer connection
input/output (HSYNCO,
CSYNCI, HSYNCI), host
interface host CPU interrupt
request output (HIRQ12,
HIRQ1, HIRQ11), SCI2
input/
output (TxD2, RxD2, SCK2),
IrDA interface input/output
(IrTxD, IrRxD), and I
2C bus
interface 1 (option)
input/output (SDA1)