SD60C32 Datasheet, PDF (4/13 Pages) AUK corp – CMOS SINGLE-COMPONENT 8-BIT MICROCOMPUTER

Pin Description (Continued)
SD60C32/P SD60C52/P
In addition, Port 1 serves the functions of the following special features of the 60C52.
Port Pin Alternate Function
P1.0
T2(External Count Input to Timer / Counter 2)
P1.1
T2EX(Timer / Counter 2 Capture/Reload Trigger and Direction Control)
Port 1 receives the low-order address bytes during ROM verification.
Port 2 : PIN 21~28 (40DIP), PIN 24~31 (44PLCC)
Port 2 is an 8-bit bi-directional I/O port with internal pullups. The port 2 output buffers can
drive LS TTL inputs.
Port 2 pins that have 1's written to them are pulled high by the internal pullups, and in
that state can be used as input.
As inputs, port 2 pins that are externally being pulled
low will source current because of the internal pullups.
Port 2 emits the high-order address byte during fetches from external Program Memory
and during accesses to external data memory that use 16-bit addresses (MOVX @ DPTR).
In this application it uses strong internal pullups when emitting 1s. During accesses to
external data memory that use 8 bit addresses (MOVX @ Ri), port 2 emits the contents
of the P2 special function register
Port 3 : PIN 10~17 (DIP 40), PIN 13~19 (PLCC44)
Port 3 is an 8bit bi-directional I/O port with internal pullups. The port 3 output buffers can
drive LS TTL input. Port 3 pins that have 1's written to them are pulled high by the internal
pullups, and in that state can be used as inputs. As inputs, Port 3 pins that are externally
being pulled low will source current because of the pullups.
Port 3 also serves the function of various special feature of the MCS-51 Family,
as listed below :
Port PIN
PIN NO.
Alternate Function
P3.0
10
RxD (Serial input port)
P3.1
11
TxD (Serial output port)
P3.2
12
INT0 (External interrupt 0)
P3.3
13
INT1 (External interrupt 1)
P3.4
14
T0 (Timer 0 external input)
P3.5
15
T1 (Timer 1 external input)
P3.6
16
WR (External data memory write strobe)
P3.7
17
RD (External data memory read strobe)
KSI-W015-000
4