UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 450

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

23.4 Memory Size Switching Register
using the memory size switching register (IMS) so that the same memory map as that of the mask ROM versions
with a different size of internal memory capacity can be achieved.
448
The PD78F0034A, 78F0034B, 78F0034AY, and 78F0034BY allow users to select the internal memory capacity
IMS is set by an 8-bit memory manipulation instruction.
RESET input sets IMS to CFH.
Caution
The IMS settings to obtain the same memory map as mask ROM versions are shown in Table 23-7.
Caution
Address: FFF0H After reset: CFH R/W
Symbol
IMS
Be sure to set the value of the target mask ROM version to IMS as an initialization setting of
the program. IMS is set to CFH by reset, so be sure to set the value of the target mask ROM
version after reset.
When using the mask ROM versions, be sure to set the value indicated in Table 23-7 to IMS.
ROM3
RAM2
RAM2
7
0
1
0
0
0
1
1
PD780021A, 780031A, 780021AY, 780031AY
PD780022A, 780032A, 780022AY, 780032AY
PD780023A, 780033A, 780023AY, 780033AY
PD780024A, 780034A, 780024AY, 780034AY
Figure 23-1. Format of Memory Size Switching Register (IMS)
Other than above
CHAPTER 23
Table 23-7. Memory Size Switching Register Settings
ROM2
RAM1
RAM1
Other than above
6
1
1
0
1
1
0
1
Target Mask ROM Versions
PD78F0034A, 78F0034B, 78F0034AY, 78F0034BY
ROM1
RAM0
RAM0
5
0
0
1
0
1
0
1
User’s Manual U14046EJ5V0UD
512 bytes
1024 bytes
Setting prohibited
ROM0
4
0
0
0
0
0
1
Internal high-speed RAM capacity selection
8 KB
16 KB
24 KB
32 KB
60 KB (setting prohibited)
Setting prohibited
ROM3
3
Internal ROM capacity selection
IMS Setting
ROM2
2
C6H
C8H
42H
44H
ROM1
1
ROM0
0