TMP47C101 Toshiba Semiconductor, TMP47C101 Datasheet - Page 20

• Manufacturer Part Number: TMP47C101
• Description: (TMP47C101 / TMP47C201) CMOS 4-bit Microcontroller
• Manufacturer: Toshiba Semiconductor

TMP47C101/201
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3. Peripheral Hardware Function
3.1 Ports
The data transfer with the external circuit and the command/
status/data transfer with the internal circuit are performed by
using the I/O instructions (13 kinds). There are 4 types of ports:
(2)
3.1.2 I/O Ports
The 47C101/201 have 4 I/O ports (11 pins) each as follows:
Output timing
Data is output to an output port or an I/O port in the S4
I/O port
Command register ;
Status register
Data register
R4, R5
R8
;
;
;
;
;
Data transfer with external cir-
Control of internal circuit
Reading the status signal from
Data transfer with internal cir-
cuit
internal circuit
cuit
4-bit input/output
2-bit input/output (shared with
external interrupt input and
timer/counter input)
Figure 3-2. Output Timing
Figure 3-1. Input Timing
through IFH). Each port is selected by specifying its port ad-
dress in an I/O instruction. Table 3-1 lists the port address as-
signments and the I/O instructions that can access the ports.
3.1.1 I/O Timing
(1)
These ports are assigned with port addresses (00H
Input timing
External data is read from an input port or an I/O port
in the S3 state of the second instruction cycle during
the input instruction (2-cycle instruction) execution.
This timing cannot be recognized from the outside, so
that the transient input such as chattering must be
processed by program.
state of the second instruction cycle during the output
instruction (2-cycle instruction) execution.
Each output port contains a latch, which holds the out-
put data. The input ports have no latch; therefore, it is
desired to hold data externally until it is read or read
twice or more before processing it.
KE
;
1-bit sense input (shared with
hold request/release signal in-
put)
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